pgsql: Add to_regnamespace() and to_regrole() to the documentation.

Add to_regnamespace() and to_regrole() to the documentation.

Commits cb9fa802b32b222b and 0c90f6769de6a60f added these functions,
but did not bother with documentation.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/83be1844acdcb0cbff31369a65ec61d588fbe9f3

Modified Files
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doc/src/sgml/func.sgml | 29 +++++++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)

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