pgsql: Forgot to add pg_pltemplate to the list of shared system catalogs

Log Message:
-----------
Forgot to add pg_pltemplate to the list of shared system catalogs that
appears in the REINDEX ref page.

Modified Files:
--------------
pgsql/doc/src/sgml/ref:
reindex.sgml (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/reindex.sgml.diff?r1=1.28&r2=1.29)