Properly document the existance of OLD/NEW trigger pl/pgsql trigger
fields.

Backpatch to 9.0 and 9.1.

Report from Pavel Stehule, patch from Josh Kupershmidt

Branch
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/e4d59f35366964298b0c9d4847f0a7efd3ddf830

Modified Files
--------------
doc/src/sgml/plpgsql.sgml |    8 ++++----
1 files changed, 4 insertions(+), 4 deletions(-)

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