pgsql: Fix relfrozenxid query in docs to include TOAST tables.

Fix relfrozenxid query in docs to include TOAST tables.

The original query ignored TOAST tables which could result in tables
needing a vacuum not being reported.

Backpatch to all live branches.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/f002dc3d4d6600a4095daf83a9584f19d0bd5844

Modified Files
--------------
doc/src/sgml/maintenance.sgml | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

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