Improve documentation about usage of FDW validator functions.

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

Commit: 01c1b1aa25149674f9347f9d915533a53c33eff6
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2013-10-28T14:30:10Z
Releases: 9.3.2
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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