Correct function name in comment of logical decoding code

Reported-by: Dave Cramer
Author: Euler Taveira
Discussion: https://postgr.es/m/CADK3HHKnPGJDLhjOFBY6+70Wd14iEH8c2GKw7UrOuUHp_GNFrA@mail.gmail.com

src/backend/replication/logical/logical.c

@@ -910,7 +910,7 @@ LogicalIncreaseXminForSlot(XLogRecPtr current_lsn, TransactionId xmin)
  * Mark the minimal LSN (restart_lsn) we need to read to replay all
  * transactions that have not yet committed at current_lsn.
  *
- * Just like IncreaseRestartDecodingForSlot this only takes effect when the
+ * Just like LogicalIncreaseXminForSlot this only takes effect when the
  * client has confirmed to have received current_lsn.
  */
 void