pgsql: Copy-editing for contrib/pg_visibility documentation.

Copy-editing for contrib/pg_visibility documentation.

Add omitted names for some function parameters.
Fix some minor grammatical issues.

Branch
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REL9_6_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/b01f9ed25950f26f85c44e31b2a97d6f1ba3534e

Modified Files
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doc/src/sgml/pgvisibility.sgml | 87 +++++++++++++++++++++---------------------
1 file changed, 44 insertions(+), 43 deletions(-)

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