Lots of doc corrections.

Josh Kupershmidt

src/backend/commands/copy.c

@@ -1984,7 +1984,7 @@ CopyFrom(CopyState cstate)
 	AfterTriggerBeginQuery();
 
 	/*
-	 * Check BEFORE STATEMENT insertion triggers. It's debateable whether we
+	 * Check BEFORE STATEMENT insertion triggers. It's debatable whether we
 	 * should do this for COPY, since it's not really an "INSERT" statement as
 	 * such. However, executing these triggers maintains consistency with the
 	 * EACH ROW triggers that we already fire on COPY.

src/backend/commands/tablecmds.c

@@ -6247,7 +6247,7 @@ ATExecValidateConstraint(Relation rel, char *constrName, bool recurse,
 			heap_close(refrel, NoLock);
 
 			/*
-			 * Foreign keys do not inherit, so we purposedly ignore the
+			 * Foreign keys do not inherit, so we purposely ignore the
 			 * recursion bit here
 			 */
 		}

src/backend/commands/typecmds.c

@@ -2754,7 +2754,7 @@ get_rels_with_domain(Oid domainOid, LOCKMODE lockmode)
 
 		/*
 		 * Confirm column has not been dropped, and is of the expected type.
-		 * This defends against an ALTER DROP COLUMN occuring just before we
+		 * This defends against an ALTER DROP COLUMN occurring just before we
 		 * acquired lock ... but if the whole table were dropped, we'd still
 		 * have a problem.
 		 */