Fix FK comment think-o

from commit d6f96ed94e

Author: Paul Jungwirth <pj@illuminatedcomputing.com>
Reviewed-by: Ian Lawrence Barwick <barwick@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/6a7c7338-1aa2-4689-d171-0b0b294fdd84%40illuminatedcomputing.com

src/backend/commands/tablecmds.c

@@ -9468,7 +9468,7 @@ ATAddForeignKeyConstraint(List **wqueue, AlteredTableInfo *tab, Relation rel,
 }
 
 /*
- * validateFkActionSetColumns
+ * validateFkOnDeleteSetColumns
  *		Verifies that columns used in ON DELETE SET NULL/DEFAULT (...)
  *		column lists are valid.
  */
@@ -9523,10 +9523,10 @@ validateFkOnDeleteSetColumns(int numfks, const int16 *fkattnums,
  * numfks is the number of columns in the foreign key
  * pkattnum is the attnum array of referenced attributes.
  * fkattnum is the attnum array of referencing attributes.
- * numfkdelsetcols is the number of columns in the ON DELETE SET NULL/DELETE
+ * numfkdelsetcols is the number of columns in the ON DELETE SET NULL/DEFAULT
  *      (...) clause
  * fkdelsetcols is the attnum array of the columns in the ON DELETE SET
- *      NULL/DELETE clause
+ *      NULL/DEFAULT clause
  * pf/pp/ffeqoperators are OID array of operators between columns.
  * old_check_ok signals that this constraint replaces an existing one that
  * was already validated (thus this one doesn't need validation).
@@ -9742,10 +9742,10 @@ addFkRecurseReferenced(List **wqueue, Constraint *fkconstraint, Relation rel,
  * pkattnum is the attnum array of referenced attributes.
  * fkattnum is the attnum array of referencing attributes.
  * pf/pp/ffeqoperators are OID array of operators between columns.
- * numfkdelsetcols is the number of columns in the ON DELETE SET NULL/DELETE
+ * numfkdelsetcols is the number of columns in the ON DELETE SET NULL/DEFAULT
  *      (...) clause
  * fkdelsetcols is the attnum array of the columns in the ON DELETE SET
- *      NULL/DELETE clause
+ *      NULL/DEFAULT clause
  * old_check_ok signals that this constraint replaces an existing one that
  *		was already validated (thus this one doesn't need validation).
  * lockmode is the lockmode to acquire on partitions when recursing.