[Trivial] Update comments referencing main.cpp

src/txmempool.cpp

@@ -395,7 +395,7 @@ bool CTxMemPool::addUnchecked(const uint256& hash, const CTxMemPoolEntry &entry,
 {
     NotifyEntryAdded(entry.GetSharedTx());
     // Add to memory pool without checking anything.
-    // Used by main.cpp AcceptToMemoryPool(), which DOES do
+    // Used by AcceptToMemoryPool(), which DOES do
     // all the appropriate checks.
     LOCK(cs);
     indexed_transaction_set::iterator newit = mapTx.insert(entry).first;