docs: add 0.20.2 and 0.20.3 release notes to master

Master carries the release notes for 0.20.0 and 0.20.1, and the 0.21
line is complete through 0.21.2, but the 0.20 patch notes stopped
being forward-ported after 0.20.1. Copy release-notes-0.20.2.md and
release-notes-0.20.3.md over from v0.20.x-branch so master holds the
full historical record.

Both files are byte-identical to their counterparts on the release
branch, and the 0.20.2 notes also match the content published at the
v0.20.2-beta tag.

docs/release-notes/release-notes-0.20.2.md

@@ -0,0 +1,85 @@
+# Release Notes
+- [Bug Fixes](#bug-fixes)
+- [New Features](#new-features)
+    - [Functional Enhancements](#functional-enhancements)
+    - [RPC Additions](#rpc-additions)
+    - [lncli Additions](#lncli-additions)
+- [Improvements](#improvements)
+    - [Functional Updates](#functional-updates)
+    - [RPC Updates](#rpc-updates)
+    - [lncli Updates](#lncli-updates)
+    - [Breaking Changes](#breaking-changes)
+    - [Performance Improvements](#performance-improvements)
+    - [Deprecations](#deprecations)
+- [Technical and Architectural Updates](#technical-and-architectural-updates)
+    - [BOLT Spec Updates](#bolt-spec-updates)
+    - [Testing](#testing)
+    - [Database](#database)
+    - [Code Health](#code-health)
+    - [Tooling and Documentation](#tooling-and-documentation)
+- [Contributors (Alphabetical Order)](#contributors)
+
+# Bug Fixes
+
+* [Fixed a panic](https://github.com/lightningnetwork/lnd/pull/10914) in the
+  DNS fallback SRV lookup, which unconditionally type-asserted each DNS Answer
+  record to `*dns.SRV` and crashed the daemon when the response contained a
+  non-SRV record. Non-SRV records are now skipped, and an empty `LookupHost`
+  result for the shim no longer triggers an out-of-bounds index.
+
+- [Fixed on-chain forward interceptor
+  settlement](https://github.com/lightningnetwork/lnd/pull/10895) after the
+  incoming channel force closes. Held forwards are now tracked as off-chain or
+  on-chain entries, allowing an on-chain re-offer to replace the old off-chain
+  hold so settlement reaches the witness beacon. Go callers of the exported
+  `htlcswitch.InterceptedPacket` type should use the new `Deadline` field to
+  distinguish off-chain auto-fail heights from on-chain settlement deadlines,
+  or `AutoFailHeight()` if they only need the legacy flattened value.
+
+# New Features
+
+## Functional Enhancements
+
+## RPC Additions
+
+## lncli Additions
+
+# Improvements
+## Functional Updates
+
+* lnd now [validates the CLTV expiry of HTLCs at the final
+  hop](https://github.com/lightningnetwork/lnd/pull/10927). A final HTLC whose
+  CLTV expiry falls outside the node's receive policy is failed back, bringing
+  the final hop in line with the CLTV delta limits already enforced on the
+  forwarding path.
+  As part of this change, the channel policy `TimeLockDelta` is now validated
+  against LND's supported forwarding bounds: any node that previously set a
+  per-channel `TimeLockDelta` greater than `2016` (the maximum default value)
+  will now have its `UpdateChannelPolicy` request rejected, and must lower the
+  value accordingly below the specified maximum.
+
+## RPC Updates
+
+## lncli Updates
+
+## Breaking Changes
+
+## Performance Improvements
+
+## Deprecations
+
+# Technical and Architectural Updates
+## BOLT Spec Updates
+
+## Testing
+
+## Database
+
+## Code Health
+
+## Tooling and Documentation
+
+# Contributors (Alphabetical Order)
+
+* Erick Cestari
+* Ziggie

docs/release-notes/release-notes-0.20.3.md

@@ -0,0 +1,116 @@
+# Release Notes
+- [Bug Fixes](#bug-fixes)
+- [New Features](#new-features)
+    - [Functional Enhancements](#functional-enhancements)
+    - [RPC Additions](#rpc-additions)
+    - [lncli Additions](#lncli-additions)
+- [Improvements](#improvements)
+    - [Functional Updates](#functional-updates)
+    - [RPC Updates](#rpc-updates)
+    - [lncli Updates](#lncli-updates)
+    - [Breaking Changes](#breaking-changes)
+    - [Performance Improvements](#performance-improvements)
+    - [Deprecations](#deprecations)
+- [Technical and Architectural Updates](#technical-and-architectural-updates)
+    - [BOLT Spec Updates](#bolt-spec-updates)
+    - [Testing](#testing)
+    - [Database](#database)
+    - [Code Health](#code-health)
+    - [Tooling and Documentation](#tooling-and-documentation)
+- [Contributors (Alphabetical Order)](#contributors-alphabetical-order)
+
+# Bug Fixes
+
+* [Bounded the memory used while syncing the channel
+  graph](https://github.com/lightningnetwork/lnd/pull/10992). A peer replying
+  to our `query_channel_range` could previously make us buffer an
+  unpredictable number of short channel IDs, as the only limit was a coarse
+  67MB cap on the bytes a single zlib-compressed reply could decompress to.
+  Replies are now capped at a precise number of short channel IDs, both
+  per-message and in aggregate across a single query, and the accumulated
+  reply state is released as soon as any reply fails validation so that a
+  peer cannot pin it by deliberately forcing an error.
+
+* [Refined invoice update
+  handling](https://github.com/lightningnetwork/lnd/pull/11024) across MPP, AMP,
+  and legacy payment paths, including keysend records and preimage-dependent
+  settlement outcomes.
+
+* [Fixed a data race](https://github.com/lightningnetwork/lnd/pull/11019) in the
+  legacy cooperative close state machine, which was advanced from both the link
+  goroutine and the peer goroutine with nothing synchronizing the two. The link
+  now reports a flushed channel to the peer's channel manager instead of driving
+  the closer itself, so every step of a close runs on a single goroutine. The
+  same change has the RBF closer validate the remote party's delivery script in
+  all cases, rather than only when an upfront shutdown script was on record for
+  that peer, and rejects an absent script instead of treating it as nothing to
+  check.
+
+* Outgoing contest resolvers now [retain the corresponding incoming HTLC
+  expiry](https://github.com/lightningnetwork/lnd/pull/11032) when transitioning
+  to timeout resolution, allowing the sweeper to continue using an
+  expiry-aware confirmation target.
+
+# New Features
+
+## Functional Enhancements
+
+## RPC Additions
+
+* The [HTLC interceptor](https://github.com/lightningnetwork/lnd/pull/10942) now
+  exposes the next hop of a blinded route that identifies it by node ID
+  (`next_node_id`) rather than by channel.
+
+## lncli Additions
+
+# Improvements
+
+## Functional Updates
+
+* [The HTLC forward interceptor now validates](https://github.com/lightningnetwork/lnd/pull/11028)
+  that derived auto-fail heights are within the supported range before they are
+  exposed through the interceptor API.
+
+## RPC Updates
+
+* `ForwardHtlcInterceptRequest.outgoing_requested_chan_id` now holds a reserved
+  sentinel value (`18446744073709551615`, all bits set) when the
+  [HTLC interceptor](https://github.com/lightningnetwork/lnd/pull/10942) reports
+  a blinded forward that identifies the next hop by node ID. The sender of such
+  a forward requests no channel, so a zero value here would make a client that
+  detects the exit hop by a zero channel ID classify the forward as a final
+  receive. Clients that switch on this field must handle the sentinel and read
+  `outgoing_requested_node_id` for the next hop.
+
+## lncli Updates
+
+## Breaking Changes
+
+## Performance Improvements
+
+## Deprecations
+
+# Technical and Architectural Updates
+
+## BOLT Spec Updates
+
+* [Fixed an issue](https://github.com/lightningnetwork/lnd/pull/10942) where an
+  lnd node acting as a relaying node (including the introduction node) in a
+  blinded path failed to forward the payment when the next hop was identified by
+  node ID (`next_node_id`) rather than a short channel ID. The next hop's public
+  key is now resolved to one of our channels with that peer using non-strict
+  forwarding.
+
+## Testing
+
+## Database
+
+## Code Health
+
+## Tooling and Documentation
+
+# Contributors (Alphabetical Order)
+
+* bitromortac
+* Olaoluwa Osuntokun
+* Ziggie