Correct behavior descriptions in comments, and correct a test name.

src/backend/replication/logical/worker.c

@@ -2252,7 +2252,7 @@ LogicalRepApplyLoop(XLogRecPtr last_received)
 			bool		requestReply = false;
 
 			/*
-			 * Check if time since last receive from standby has reached the
+			 * Check if time since last receive from primary has reached the
 			 * configured limit.
 			 */
 			if (wal_receiver_timeout > 0)

src/backend/replication/walreceiver.c

@@ -537,7 +537,7 @@ WalReceiverMain(void)
 					bool		requestReply = false;
 
 					/*
-					 * Check if time since last receive from standby has
+					 * Check if time since last receive from primary has
 					 * reached the configured limit.
 					 */
 					if (wal_receiver_timeout > 0)

src/test/perl/PostgresNode.pm

@@ -1368,7 +1368,7 @@ both B<stdout> and B<stderr> the results may be interleaved unpredictably.
 =item on_error_stop => 1
 
 By default, the B<psql> method invokes the B<psql> program with ON_ERROR_STOP=1
-set, so SQL execution is stopped at the first error and exit code 2 is
+set, so SQL execution is stopped at the first error and exit code 3 is
 returned.  Set B<on_error_stop> to 0 to ignore errors instead.
 
 =item on_error_die => 0

src/test/recovery/t/020_archive_status.pl

@@ -145,7 +145,7 @@ $standby1->start;
 # that all segments needed are restored from the archives.
 $standby1->poll_query_until('postgres',
 	qq{ SELECT pg_wal_lsn_diff(pg_last_wal_replay_lsn(), '$primary_lsn') >= 0 }
-) or die "Timed out while waiting for xlog replay on standby2";
+) or die "Timed out while waiting for xlog replay on standby1";
 
 $standby1->safe_psql('postgres', q{CHECKPOINT});