Document PERFORM limitation when using WITH queries.

Backpatch to 9.0 and 9.1.

Report from depstein(at)alliedtesting(dot)com(dot)

Branch
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REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/94bf47db8ffc13005d9b14ec3331f6db94a91d46

Modified Files
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doc/src/sgml/plpgsql.sgml |    3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

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