More synchronous replication typo fixes.

Fujii Masao

src/backend/replication/syncrep.c

@@ -225,7 +225,7 @@ SyncRepWaitForLSN(XLogRecPtr XactCommitLSN)
 /*
  * Insert MyProc into SyncRepQueue, maintaining sorted invariant.
  *
- * Usually we will go at tail of queue, though its possible that we arrive
+ * Usually we will go at tail of queue, though it's possible that we arrive
  * here out of order, so start at tail and work back to insertion point.
  */
 static void

src/include/storage/proc.h

@@ -122,7 +122,7 @@ struct PGPROC
 	 * Info to allow us to wait for synchronous replication, if needed.
 	 * waitLSN is InvalidXLogRecPtr if not waiting; set only by user backend.
 	 * syncRepState must not be touched except by owning process or WALSender.
-	 * syncRep_links used only while holding SyncRepLock.
+	 * syncRepLinks used only while holding SyncRepLock.
 	 */
 	Latch		waitLatch;			/* allow us to wait for sync rep */
 	XLogRecPtr	waitLSN;			/* waiting for this LSN or higher */