other changes

Also, during the pgindent run, we have TypeTupleForm and
AttributeTupleForm, while we also have Form_pg_class, etc.

Seems they should be named similar.  It will make the Developers FAQ
item 9 easier to understand if we have uniform way to cast a HeapTuple
pointer.

    TypeTupleForm -> Form_pg_type

In fact the comments in pg_type.h talk about Form_pg_type, but they then
define TypeTupleForm.

Any problems with changing this?

---------------------------------------------------------------------------


/* ----------------
 *      Form_pg_type corresponds to a pointer to a row with
 *      the format of pg_type relation.
 * ----------------
 */
typedef TypeTupleFormData *TypeTupleForm;

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