Log Message:
-----------
Mention max_prepared_transactions in PREPARE TRANSACTION reference page,
per Bruce's suggestion.
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
prepare_transaction.sgml (r1.2 -> r1.3)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/prepare_transaction.sgml.diff?r1=1.2&r2=1.3)