pgsql: docs: document TRIM "comma" syntax

docs: document TRIM "comma" syntax

This syntax is supported by the parser, but is non-standard.

_Not_ backpatched to 9.3 in case we change our minds.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/5368a23eeb1f530d7c683b207074901c1a5417c4

Modified Files
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doc/src/sgml/func.sgml | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)

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