Improve description of inquiry functions that accept regclass.

Per a suggestion from Thom Brown, though this is not his proposed patch.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/cfcdc99db67172d46a5e226375fa97e5c5a62267

Modified Files
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doc/src/sgml/func.sgml |   30 ++++++++++++++++++++----------
1 files changed, 20 insertions(+), 10 deletions(-)

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	Subject: pgsql: Minor copy-editing in CREATE TRIGGER reference page.