Fix misc spelling mistakes in comments, docs and tests

contrib/test_decoding/specs/parallel_session_origin.spec

@@ -50,9 +50,10 @@ step "s1_store_lsn" {
 }
 step "s1_reset" { SELECT pg_replication_origin_session_reset(); }
 
-# Firstly s0 attaches to a origin and s1 attaches to the same. Both sessions
-# commits a transaction and store the local_lsn of the replication origin.
-# Compare LSNs and expect latter transaction (done by s1) has larger local_lsn.
+# First s0 and s1 attach to the same origin.  Then both sessions
+# commit a transaction and store the local_lsn of the replication
+# origin.  Compare LSNs and expect that the latter transaction (done
+# by s1) has a larger local_lsn.
 permutation "s0_setup" "s0_is_setup" "s1_setup" "s1_is_setup" "s0_add_message" "s0_store_lsn" "s1_add_message" "s1_store_lsn" "s0_compare" "s1_reset" "s0_reset"
 
 # Test that the origin cannot be released if another session is actively using

doc/src/sgml/gist.sgml

@@ -944,7 +944,7 @@ my_fetch(PG_FUNCTION_ARGS)
     fetched_data = palloc_object(fetched_data_type);
 
     /*
-     * Convert 'fetched_data' into the a Datum of the original datatype.
+     * Convert 'fetched_data' into a Datum of the original datatype.
      */
 
     /* fill *retval from fetched_data. */

src/backend/access/transam/xlog.c

@@ -8785,10 +8785,10 @@ UpdateFullPageWrites(void)
 
 	/*
 	 * It's always safe to take full page images, even when not strictly
-	 * required, but not the other round. So if we're setting full_page_writes
-	 * to true, first set it true and then write the WAL record. If we're
-	 * setting it to false, first write the WAL record and then set the global
-	 * flag.
+	 * required, but not the other way round. So if we're setting
+	 * full_page_writes to true, first set it true and then write the WAL
+	 * record. If we're setting it to false, first write the WAL record and
+	 * then set the global flag.
 	 */
 	if (fullPageWrites)
 	{

src/backend/utils/cache/inval.c

@@ -1911,7 +1911,7 @@ CallSyscacheCallbacks(SysCacheIdentifier cacheid, uint32 hashvalue)
 }
 
 /*
- * CallSyscacheCallbacks
+ * CallRelSyncCallbacks
  */
 void
 CallRelSyncCallbacks(Oid relid)

src/interfaces/libpq/t/003_load_balance_host_list.pl

@@ -76,7 +76,7 @@ $node2->stop();
 # working one.
 $node3->connect_ok(
 	"host=$hostlist port=$portlist load_balance_hosts=disable",
-	"load_balance_hosts=disable continues until it connects to the a working node",
+	"load_balance_hosts=disable continues until it connects to a working node",
 	sql => "SELECT 'connect3'",
 	log_like => [qr/statement: SELECT 'connect3'/]);
 
@@ -86,7 +86,7 @@ foreach my $i (1 .. 5)
 {
 	$node3->connect_ok(
 		"host=$hostlist port=$portlist load_balance_hosts=random",
-		"load_balance_hosts=random continues until it connects to the a working node",
+		"load_balance_hosts=random continues until it connects to a working node",
 		sql => "SELECT 'connect4'",
 		log_like => [qr/statement: SELECT 'connect4'/]);
 }