pgsql: Update item for GUID: < * Add 128-bit Universally Unique

Log Message:
-----------
Update item for GUID:

< * Add 128-bit Universally Unique Identifier (UUID)

* Add Globally/Universally Unique Identifier (GUID/UUID)

Modified Files:
--------------
pgsql/doc:
TODO (r1.1909 -> r1.1910)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1909&amp;r2=1.1910)
pgsql/doc/src/FAQ:
TODO.html (r1.412 -> r1.413)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.412&amp;r2=1.413)