Document that contrib/pgtrgm only processes ASCII alphanumeric
characters.

Backpatch to 9.0 and 9.1.

Branch
------
REL9_0_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/3de09ddac58882d9abc5e3327e4d2b0b1238ab54

Modified Files
--------------
doc/src/sgml/pgtrgm.sgml |    3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

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