pgsql: Improve documentation about usage of FDW validator functions.

Improve documentation about usage of FDW validator functions.

SGML documentation, as well as code comments, failed to note that an FDW's
validator will be applied to foreign-table options for foreign tables using
the FDW.

Etsuro Fujita

Branch
------
REL9_3_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/01c1b1aa25149674f9347f9d915533a53c33eff6

Modified Files
--------------
doc/src/sgml/ref/alter_foreign_data_wrapper.sgml | 12 +++++++-----
doc/src/sgml/ref/create_foreign_data_wrapper.sgml | 8 ++++----
src/backend/commands/foreigncmds.c | 12 ++++++++----
3 files changed, 19 insertions(+), 13 deletions(-)

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