Fix an assortment of spelling mistakes and typos

Author: Alexander Lakhin <exclusion@gmail.com>
Discussion: https://postgr.es/m/5812a0b9-b0cf-4151-9a14-d9f00e4f2858@gmail.com

Author: david-rowley

src/backend/access/heap/heapam.c

@@ -6387,7 +6387,7 @@ heap_inplace_update_and_unlock(Relation relation,
 	 *
 	 * ["D" is a VACUUM (ONLY_DATABASE_STATS)]
 	 * ["R" is a VACUUM tbl]
-	 * D: vac_update_datfrozenid() -> systable_beginscan(pg_class)
+	 * D: vac_update_datfrozenxid() -> systable_beginscan(pg_class)
 	 * D: systable_getnext() returns pg_class tuple of tbl
 	 * R: memcpy() into pg_class tuple of tbl
 	 * D: raise pg_database.datfrozenxid, XLogInsert(), finish

src/backend/access/heap/pruneheap.c

@@ -2133,7 +2133,7 @@ log_heap_prune_and_freeze(Relation relation, Buffer buffer,
 							sizeof(OffsetNumber) * nfrozen);
 
 	/*
-	 * Prepare the main xl_heap_prune record.  We already set the XLPH_HAS_*
+	 * Prepare the main xl_heap_prune record.  We already set the XLHP_HAS_*
 	 * flag above.
 	 */
 	if (RelationIsAccessibleInLogicalDecoding(relation))

src/backend/access/nbtree/nbtutils.c

@@ -2584,7 +2584,7 @@ _bt_preprocess_keys(IndexScanDesc scan)
 	{
 		inkeys = arrayKeyData;
 
-		/* Also maintain keyDataMap for remapping so->orderProc[] later */
+		/* Also maintain keyDataMap for remapping so->orderProcs[] later */
 		keyDataMap = MemoryContextAlloc(so->arrayContext,
 										numberOfKeys * sizeof(int));
 	}

src/backend/access/transam/xlog.c

@@ -554,7 +554,7 @@ typedef struct XLogCtlData
 } XLogCtlData;
 
 /*
- * Classification of XLogRecordInsert operations.
+ * Classification of XLogInsertRecord operations.
  */
 typedef enum
 {

src/backend/catalog/pg_constraint.c

@@ -1600,7 +1600,7 @@ DeconstructFkConstraintRow(HeapTuple tuple, int *numfks,
 }
 
 /*
- * FindFkPeriodOpers -
+ * FindFKPeriodOpers -
  *
  * Looks up the operator oids used for the PERIOD part of a temporal foreign key.
  * The opclass should be the opclass of that PERIOD element.

src/backend/catalog/pg_depend.c

@@ -35,7 +35,7 @@ static bool isObjectPinned(const ObjectAddress *object);
 
 
 /*
- * Record a dependency between 2 objects via their respective objectAddress.
+ * Record a dependency between 2 objects via their respective ObjectAddress.
  * The first argument is the dependent object, the second the one it
  * references.
  *

src/backend/catalog/storage.c

@@ -380,7 +380,7 @@ RelationTruncate(Relation rel, BlockNumber nblocks)
 	 * replay or visibility invariants downstream.  The critical section also
 	 * suppresses interrupts.
 	 *
-	 * (See also pg_visibilitymap.c if changing this code.)
+	 * (See also visibilitymap.c if changing this code.)
 	 */
 	START_CRIT_SECTION();
 

src/backend/commands/explain.c

@@ -1384,8 +1384,8 @@ ExplainPreScanNode(PlanState *planstate, Bitmapset **rels_used)
 /*
  * plan_is_disabled
  *		Checks if the given plan node type was disabled during query planning.
- *		This is evident by the disable_node field being higher than the sum of
- *		the disabled_node field from the plan's children.
+ *		This is evident by the disabled_nodes field being higher than the sum of
+ *		the disabled_nodes field from the plan's children.
  */
 static bool
 plan_is_disabled(Plan *plan)
@@ -1462,8 +1462,8 @@ plan_is_disabled(Plan *plan)
 	}
 
 	/*
-	 * It's disabled if the plan's disable_nodes is higher than the sum of its
-	 * child's plan disabled_nodes.
+	 * It's disabled if the plan's disabled_nodes is higher than the sum of
+	 * its child's plan disabled_nodes.
 	 */
 	if (plan->disabled_nodes > child_disabled_nodes)
 		return true;

src/backend/optimizer/path/indxpath.c

@@ -2620,7 +2620,7 @@ match_clause_to_index(PlannerInfo *root,
  *
  *	  It is also possible to match a list of OR clauses if it might be
  *	  transformed into a single ScalarArrayOpExpr clause.  On success,
- *	  the returning index clause will contain a trasformed clause.
+ *	  the returning index clause will contain a transformed clause.
  *
  *	  For boolean indexes, it is also possible to match the clause directly
  *	  to the indexkey; or perhaps the clause is (NOT indexkey).

src/backend/postmaster/postmaster.c

@@ -2827,7 +2827,7 @@ PostmasterStateMachine(void)
 
 	/*
 	 * In the PM_WAIT_BACKENDS state, wait for all the regular backends and
-	 * procesess like autovacuum and background workers that are comparable to
+	 * processes like autovacuum and background workers that are comparable to
 	 * backends to exit.
 	 *
 	 * PM_STOP_BACKENDS is a transient state that means the same as