pgsql: Do some copy-editing on the docs for row-level security.

Do some copy-editing on the docs for row-level security.

Clarifications, markup improvements, corrections of misleading or
outright wrong statements.

Branch
------
REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/35adf6e44cb65111f7caf5a9988c0738790ef02d

Modified Files
--------------
doc/src/sgml/ddl.sgml | 178 ++++++++++++++------------
doc/src/sgml/ref/alter_policy.sgml | 23 +++-
doc/src/sgml/ref/create_policy.sgml | 241 +++++++++++++++++++----------------
doc/src/sgml/ref/drop_policy.sgml | 9 +-
4 files changed, 246 insertions(+), 205 deletions(-)

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