Fix various typos

This fixes many spelling mistakes in comments, but a few references to
invalid parameter names, function names and option names too in comments
and also some in string constants

Also, fix an #undef that was undefining the incorrect definition

Author: Alexander Lakhin
Reviewed-by: Justin Pryzby
Discussion: https://postgr.es/m/d5f68d19-c0fc-91a9-118d-7c6a5a3f5fad@gmail.com

Author: david-rowley

contrib/amcheck/verify_heapam.c

@@ -1009,7 +1009,7 @@ check_tuple_header(HeapCheckContext *ctx)
  * TOAST tuples -- are eligible for pruning.
  *
  * Sets *xmin_commit_status_ok to true if the commit status of xmin is known
- * and false otherwise. If it's set to true, then also set *xid_commit_status
+ * and false otherwise. If it's set to true, then also set *xmin_commit_status
  * to the actual commit status.
  */
 static bool

contrib/pg_walinspect/pg_walinspect.c

@@ -401,7 +401,7 @@ GetWALBlockInfo(FunctionCallInfo fcinfo, XLogReaderState *record,
 							 values, nulls);
 	}
 
-#undef PG_GET_WAL_FPI_BLOCK_COLS
+#undef PG_GET_WAL_BLOCK_INFO_COLS
 }
 
 /*

contrib/postgres_fdw/connection.c

@@ -1686,7 +1686,7 @@ pgfdw_abort_cleanup(ConnCacheEntry *entry, bool toplevel)
  *
  * Returns true if the abort command or cancel request is successfully issued,
  * false otherwise.  If the abort command is successfully issued, the given
- * connection cache entry is appended to *pending_entries.  Othewise, if the
+ * connection cache entry is appended to *pending_entries.  Otherwise, if the
  * cancel request is successfully issued, it is appended to *cancel_requested.
  */
 static bool

contrib/postgres_fdw/postgres_fdw.c

@@ -5016,7 +5016,7 @@ postgresGetAnalyzeInfoForForeignTable(Relation relation, bool *can_tablesample)
 			pgfdw_report_error(ERROR, res, conn, false, sql.data);
 
 		if (PQntuples(res) != 1 || PQnfields(res) != 2)
-			elog(ERROR, "unexpected result from deparseAnalyzeTuplesSql query");
+			elog(ERROR, "unexpected result from deparseAnalyzeInfoSql query");
 		reltuples = strtod(PQgetvalue(res, 0, 0), NULL);
 		relkind = *(PQgetvalue(res, 0, 1));
 	}

meson.build

@@ -2963,7 +2963,7 @@ endif
 # generation happens during install, so that's not a real issue.
 nls_mo_targets = []
 if libintl.found() and meson.version().version_compare('>=0.60')
-  # use range() to avoid the flattening of the list that forech() would do
+  # use range() to avoid the flattening of the list that foreach() would do
   foreach off : range(0, nls_targets.length())
     # i18n.gettext() list containing 1) list of built .mo files 2) maintainer
     # -pot target 3) maintainer -pot target

src/backend/backup/basebackup.c

@@ -254,7 +254,7 @@ perform_base_backup(basebackup_options *opt, bbsink *sink)
 
 	total_checksum_failures = 0;
 
-	/* Allocate backup related varilables. */
+	/* Allocate backup related variables. */
 	backup_state = (BackupState *) palloc0(sizeof(BackupState));
 	tablespace_map = makeStringInfo();
 

src/backend/executor/execUtils.c

@@ -1403,7 +1403,7 @@ GetResultRTEPermissionInfo(ResultRelInfo *relinfo, EState *estate)
 }
 
 /*
- * GetResultRelCheckAsUser
+ * ExecGetResultRelCheckAsUser
  *		Returns the user to modify passed-in result relation as
  *
  * The user is chosen by looking up the relation's or, if a child table, its

src/backend/executor/nodeModifyTable.c

@@ -904,7 +904,7 @@ ExecInsert(ModifyTableContext *context,
 			 * If these are the first tuples stored in the buffers, add the
 			 * target rel and the mtstate to the
 			 * es_insert_pending_result_relations and
-			 * es_insert_pending_modifytables lists respectively, execpt in
+			 * es_insert_pending_modifytables lists respectively, except in
 			 * the case where flushing was done above, in which case they
 			 * would already have been added to the lists, so no need to do
 			 * this.

src/backend/rewrite/rewriteManip.c

@@ -343,7 +343,7 @@ contains_multiexpr_param(Node *node, void *context)
  * the RTEs in 'src_rtable' to now point to the perminfos' indexes in
  * *dst_perminfos.
  *
- * Note that this changes both 'dst_rtable' and 'dst_perminfo' destructively,
+ * Note that this changes both 'dst_rtable' and 'dst_perminfos' destructively,
  * so the caller should have better passed safe-to-modify copies.
  */
 void

src/backend/storage/buffer/bufmgr.c

@@ -2046,7 +2046,7 @@ ExtendBufferedRelShared(ExtendBufferedWhat eb,
 	io_start = pgstat_prepare_io_time();
 
 	/*
-	 * Note: if smgzerorextend fails, we will end up with buffers that are
+	 * Note: if smgrzeroextend fails, we will end up with buffers that are
 	 * allocated but not marked BM_VALID.  The next relation extension will
 	 * still select the same block number (because the relation didn't get any
 	 * longer on disk) and so future attempts to extend the relation will find