pgsql: Remove tabs from SGML files.

Log Message:
-----------
Remove tabs from SGML files.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        cube.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/cube.sgml?r1=1.1&r2=1.2)
        intagg.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/intagg.sgml?r1=1.1&r2=1.2)
        isn.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/isn.sgml?r1=1.1&r2=1.2)
        oid2name.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/oid2name.sgml?r1=1.1&r2=1.2)
        pgbench.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/pgbench.sgml?r1=1.1&r2=1.2)
        pgcrypto.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/pgcrypto.sgml?r1=1.1&r2=1.2)
        pgrowlocks.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/pgrowlocks.sgml?r1=1.1&r2=1.2)
        pgstattuple.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/pgstattuple.sgml?r1=1.1&r2=1.2)
        seg.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/seg.sgml?r1=1.1&r2=1.2)
        sslinfo.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/sslinfo.sgml?r1=1.1&r2=1.2)
        tablefunc.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/tablefunc.sgml?r1=1.1&r2=1.2)
        trgm.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/trgm.sgml?r1=1.1&r2=1.2)
        xml2.sgml (r1.1 -> r1.2)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xml2.sgml?r1=1.1&r2=1.2)