pgsql: Add 8.2.0 "Incomatibilities" documentation that pg_dump's -n and

Log Message:
-----------
Add 8.2.0 "Incomatibilities" documentation that pg_dump's -n and -t
behavior has changed.

Modified Files:
--------------
pgsql/doc/src/sgml:
release.sgml (r1.493 -> r1.494)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.493&r2=1.494)