pgsql: Not done: < o -Allow an existing index to be marked as a

Log Message:
-----------
Not done:

< o -Allow an existing index to be marked as a table's primary key

o Allow an existing index to be marked as a table's primary key

Modified Files:
--------------
pgsql/doc:
TODO (r1.2501 -> r1.2502)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/TODO?r1=1.2501&amp;r2=1.2502)
pgsql/doc/src/FAQ:
TODO.html (r1.1007 -> r1.1008)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html?r1=1.1007&amp;r2=1.1008)