Fix typos in comments.

Author: hlinnaka

src/backend/storage/ipc/standby.c

@@ -893,10 +893,10 @@ LogStandbySnapshot(void)
 	 * For Hot Standby this can be done before inserting the WAL record
 	 * because ProcArrayApplyRecoveryInfo() rechecks the commit status using
 	 * the clog. For logical decoding, though, the lock can't be released
-	 * early becuase the clog might be "in the future" from the POV of the
+	 * early because the clog might be "in the future" from the POV of the
 	 * historic snapshot. This would allow for situations where we're waiting
 	 * for the end of a transaction listed in the xl_running_xacts record
-	 * which, according to the WAL, have commit before the xl_running_xacts
+	 * which, according to the WAL, has committed before the xl_running_xacts
 	 * record. Fortunately this routine isn't executed frequently, and it's
 	 * only a shared lock.
 	 */

src/backend/utils/adt/formatting.c

@@ -3587,7 +3587,7 @@ do_to_timestamp(text *date_txt, text *fmt,
 		if (tmfc.bc)
 			tmfc.cc = -tmfc.cc;
 		if (tmfc.cc >= 0)
-			/* +1 becuase 21st century started in 2001 */
+			/* +1 because 21st century started in 2001 */
 			tm->tm_year = (tmfc.cc - 1) * 100 + 1;
 		else
 			/* +1 because year == 599 is 600 BC */