message: [validation] Remove comment about AcceptToMemoryPool()
  "This logic is not necessary for memory pool transactions, as
  AcceptToMemoryPool already refuses previously-known transaction ids
  entirely." refers to the logic at
  which was later removed in commit
diff: @@ -1685,8 +1685,6 @@ bool CChainState::ConnectBlock(const CBlock& block, BlockValidationState& state,
  // can be duplicated to remove the ability to spend the first instance -- even after
  // being sent to another address.
  // See BIP30, CVE-2012-1909, and http://r6.ca/blog/20120206T005236Z.html for more information.
  - // This logic is not necessary for memory pool transactions, as AcceptToMemoryPool
  - // already refuses previously-known transaction ids entirely.
  // This rule was originally applied to all blocks with a timestamp after March 15, 2012, 0:00 UTC.
  // Now that the whole chain is irreversibly beyond that time it is applied to all blocks except the
  // two in the chain that violate it. This prevents exploiting the issue against nodes during their
  