Log Message:
-----------
Adjust the description of locking to clarify that locks held by a
subtransaction are released if the subtransaction aborts --- in user-level
terminology, this means either rolling back to a savepoint or escaping from
a plpgsql exception block. Per recent suggestion from Simon.
Modified Files:
--------------
pgsql/doc/src/sgml:
mvcc.sgml (r2.64 -> r2.65)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/mvcc.sgml.diff?r1=2.64&r2=2.65)