pgsql: Remove item: < o ARRAY[[1, 2], [3, 4]])[1] should return the same

Log Message:
-----------
Remove item:

< o ARRAY[[1,2],[3,4]])[1] should return the same values as
< ARRAY[[1,2],[3,4]])[1:1];
<

Modified Files:
--------------
pgsql/doc:
TODO (r1.2107 -> r1.2108)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.2107&r2=1.2108)
pgsql/doc/src/FAQ:
TODO.html (r1.608 -> r1.609)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.608&r2=1.609)