Improve documentation about usage of FDW validator functions.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: c2b51cf1903d5ed5e962ed68b4a4eeb40fe037db
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2013-10-28T14:28:35Z
Releases: 9.4.0
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

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