Log Message:
-----------
Mention that when alter rewrites a table, indexes are also rebuilt.
Modified Files:
--------------
pgsql/doc/src/sgml/ref:
alter_table.sgml (r1.114 -> r1.115)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/alter_table.sgml?r1=1.114&r2=1.115)