pgsql: Add URL for: o Research self-referential UPDATEs that

Log Message:
-----------
Add URL for:

o Research self-referential UPDATEs that see inconsistent row versions
in read-committed mode
<

http://archives.postgresql.org/pgsql-hackers/2007-06/msg00016.php

Modified Files:
--------------
pgsql/doc:
TODO (r1.2196 -> r1.2197)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.2196&amp;r2=1.2197)
pgsql/doc/src/FAQ:
TODO.html (r1.697 -> r1.698)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.697&amp;r2=1.698)