Fix more typos in comments.

Patch by CharSyam, plus a few more I spotted with grep.

src/backend/commands/event_trigger.c

@@ -883,7 +883,7 @@ EventTriggerSQLDrop(Node *parsetree)
 	/*
 	 * Nothing to do if run list is empty.  Note this shouldn't happen,
 	 * because if there are no sql_drop events, then objects-to-drop wouldn't
-	 * have been collected in the first place and we would have quitted above.
+	 * have been collected in the first place and we would have quit above.
 	 */
 	if (runlist == NIL)
 		return;

src/backend/commands/vacuumlazy.c

@@ -952,7 +952,7 @@ lazy_scan_heap(Relation onerel, LVRelStats *vacrelstats,
 				heap_execute_freeze_tuple(htup, &frozen[i]);
 			}
 
-			/* Now WAL-log freezing if neccessary */
+			/* Now WAL-log freezing if necessary */
 			if (RelationNeedsWAL(onerel))
 			{
 				XLogRecPtr	recptr;