Обсуждение: pgsql: Remove hstore's text[] => text[] operator.

Log Message:
-----------
Remove hstore's text[] => text[] operator.

This is not yet in any released version, so we still have the option to
backtrack.  Instead, document hstore(text[], text[]).  Per discussion.

Modified Files:
--------------
    pgsql/contrib/hstore:
        hstore.sql.in (r1.12 -> r1.13)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/hstore.sql.in?r1=1.12&r2=1.13)
    pgsql/contrib/hstore/expected:
        hstore.out (r1.5 -> r1.6)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/expected/hstore.out?r1=1.5&r2=1.6)
    pgsql/contrib/hstore/sql:
        hstore.sql (r1.5 -> r1.6)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/sql/hstore.sql?r1=1.5&r2=1.6)
    pgsql/doc/src/sgml:
        hstore.sgml (r1.8 -> r1.9)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/hstore.sgml?r1=1.8&r2=1.9)