pgsql: Add URLs for: * Allow sequential scans to take advantage of

Log Message:
-----------
Add URLs for:

* Allow sequential scans to take advantage of other concurrent
sequential scans, also called "Synchronised Scanning"

http://archives.postgresql.org/pgsql-patches/2006-12/msg00076.php
http://archives.postgresql.org/pgsql-hackers/2006-12/msg00408.php

Modified Files:
--------------
pgsql/doc:
TODO (r1.2071 -> r1.2072)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.2071&r2=1.2072)
pgsql/doc/src/FAQ:
TODO.html (r1.572 -> r1.573)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.572&r2=1.573)