[COMMITTERS] pgsql: Improve the CREATE POLICY documentation.

Improve the CREATE POLICY documentation.

Provide a correct description of how multiple policies are combined,
clarify when SELECT permissions are required, mention SELECT FOR
UPDATE/SHARE, and do some other more minor tidying up.

Reviewed by Stephen Frost

Discussion: https://postgr.es/m/CAEZATCVrxyYbOFU8XbGHicz%2BmXPYzw%3DhfNL2XTphDt-53TomQQ%40mail.gmail.com

Back-patch to 9.5.

Branch
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REL9_5_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/6a21eb31b6deb0f76e8304fb9f12df272ed59f0c

Modified Files
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doc/src/sgml/ref/create_policy.sgml | 170 +++++++++++++++++++++++-------------
1 file changed, 108 insertions(+), 62 deletions(-)


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