Fix misc typos, mostly in comments.

A collection of typos I happened to spot while reading code, as well as
grepping for common mistakes.

Backpatch to all supported versions, as applicable, to avoid conflicts
when backporting other commits in the future.

5 files changed, 7 insertions, 7 deletions

diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c
index 7142ecede0a..4421a2267d8 100644
--- a/src/backend/access/transam/multixact.c
+++ b/src/backend/access/transam/multixact.c
@@ -2555,7 +2555,7 @@ SetOffsetVacuumLimit(bool is_startup)
 
 	/*
 	 * NB: Have to prevent concurrent truncation, we might otherwise try to
-	 * lookup a oldestMulti that's concurrently getting truncated away.
+	 * lookup an oldestMulti that's concurrently getting truncated away.
 	 */
 	LWLockAcquire(MultiXactTruncationLock, LW_SHARED);
 
@@ -2732,7 +2732,7 @@ find_multixact_start(MultiXactId multi, MultiXactOffset *result)
 	/*
 	 * Flush out dirty data, so PhysicalPageExists can work correctly.
 	 * SimpleLruFlush() is a pretty big hammer for that.  Alternatively we
-	 * could add a in-memory version of page exists, but find_multixact_start
+	 * could add an in-memory version of page exists, but find_multixact_start
 	 * is called infrequently, and it doesn't seem bad to flush buffers to
 	 * disk before truncation.
 	 */
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index dfd089f63ca..fe2d4f147d7 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -1565,7 +1565,7 @@ finish_heap_swap(Oid OIDOldHeap, Oid OIDNewHeap,
 	 * swap_relation_files()), thus relfrozenxid was not updated. That's
 	 * annoying because a potential reason for doing a VACUUM FULL is a
 	 * imminent or actual anti-wraparound shutdown.  So, now that we can
-	 * access the new relation using it's indices, update relfrozenxid.
+	 * access the new relation using its indices, update relfrozenxid.
 	 * pg_class doesn't have a toast relation, so we don't need to update the
 	 * corresponding toast relation. Not that there's little point moving all
 	 * relfrozenxid updates here since swap_relation_files() needs to write to
diff --git a/src/backend/executor/nodeModifyTable.c b/src/backend/executor/nodeModifyTable.c
index acd27b04821..7de4568b03e 100644
--- a/src/backend/executor/nodeModifyTable.c
+++ b/src/backend/executor/nodeModifyTable.c
@@ -1097,7 +1097,7 @@ lreplace:;
  * (but still lock row, even though it may not satisfy estate's
  * snapshot).
  *
- * Returns true if if we're done (with or without an update), or false if
+ * Returns true if we're done (with or without an update), or false if
  * the caller must retry the INSERT from scratch.
  */
 static bool
diff --git a/src/backend/replication/logical/origin.c b/src/backend/replication/logical/origin.c
index 6a1d8a63d92..f911b651493 100644
--- a/src/backend/replication/logical/origin.c
+++ b/src/backend/replication/logical/origin.c
@@ -1449,7 +1449,7 @@ pg_show_replication_origin_status(PG_FUNCTION_ARGS)
 	int			i;
 #define REPLICATION_ORIGIN_PROGRESS_COLS 4
 
-	/* we we want to return 0 rows if slot is set to zero */
+	/* we want to return 0 rows if slot is set to zero */
 	replorigin_check_prerequisites(false, true);
 
 	if (rsinfo == NULL || !IsA(rsinfo, ReturnSetInfo))
diff --git a/src/backend/utils/time/snapmgr.c b/src/backend/utils/time/snapmgr.c
index addf87dc3bb..cbefc4ba03b 100644
--- a/src/backend/utils/time/snapmgr.c
+++ b/src/backend/utils/time/snapmgr.c
@@ -1087,8 +1087,8 @@ AtEOXact_Snapshot(bool isCommit, bool resetXmin)
 		 * it's too late to abort the transaction, and (2) leaving a leaked
 		 * file around has little real consequence anyway.
 		 *
-		 * We also also need to remove the snapshots from RegisteredSnapshots
-		 * to prevent a warning below.
+		 * We also need to remove the snapshots from RegisteredSnapshots to
+		 * prevent a warning below.
 		 *
 		 * As with the FirstXactSnapshot, we don't need to free resources of
 		 * the snapshot iself as it will go away with the memory context.