Remove parentheses from mention of current_schemas function.
Remove parentheses from mention of current_schemas function.

This is more consistent with what we do elsewhere, and hopefully avoids
creating the perception that current_schemas takes no arguments.

As suggested by Brendan Jurd

jmcatamney/gpdb,kmjungersen/PostgresXL,postmind-net/postgres-xl,lisakowen/gpdb,greenplum-db/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,jmcatamney/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,jmcatamney/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,arcivanov/postgres-xl,lisakowen/gpdb,kmjungersen/PostgresXL,oberstet/postgres-xl,50wu/gpdb,tpostgres-projects/tPostgres,kmjungersen/PostgresXL,oberstet/postgres-xl,snaga/postgres-xl,tpostgres-projects/tPostgres,yazun/postgres-xl,50wu/gpdb,lisakowen/gpdb,lisakowen/gpdb,arcivanov/postgres-xl,greenplum-db/gpdb,tpostgres-projects/tPostgres,greenplum-db/gpdb,greenplum-db/gpdb,arcivanov/postgres-xl,pavanvd/postgres-xl,50wu/gpdb,lisakowen/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,oberstet/postgres-xl,greenplum-db/gpdb,adam8157/gpdb,50wu/gpdb,ovr/postgres-xl,pavanvd/postgres-xl,pavanvd/postgres-xl,snaga/postgres-xl,ashwinstar/gpdb,Postgres-XL/Postgres-XL,oberstet/postgres-xl,jmcatamney/gpdb,xinzweb/gpdb,jmcatamney/gpdb,tpostgres-projects/tPostgres,jmcatamney/gpdb,adam8157/gpdb,kmjungersen/PostgresXL,ovr/postgres-xl,adam8157/gpdb,pavanvd/postgres-xl,lisakowen/gpdb,ashwinstar/gpdb,yazun/postgres-xl,greenplum-db/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,arcivanov/postgres-xl,lisakowen/gpdb,lisakowen/gpdb,xinzweb/gpdb,ashwinstar/gpdb,adam8157/gpdb,oberstet/postgres-xl,ashwinstar/gpdb,arcivanov/postgres-xl,zeroae/postgres-xl,yazun/postgres-xl,yazun/postgres-xl,postmind-net/postgres-xl,ashwinstar/gpdb,snaga/postgres-xl,xinzweb/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,postmind-net/postgres-xl,adam8157/gpdb,snaga/postgres-xl,50wu/gpdb,50wu/gpdb,techdragon/Postgres-XL,ashwinstar/gpdb,snaga/postgres-xl,ovr/postgres-xl,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,yazun/postgres-xl,arcivanov/postgres-xl,xinzweb/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,postmind-net/postgres-xl,zeroae/postgres-xl,techdragon/Postgres-XL,adam8157/gpdb,50wu/gpdb,adam8157/gpdb,postmind-net/postgres-xl,adam8157/gpdb,xinzweb/gpdb,zeroae/postgres-xl,tpostgres-projects/tPostgres,pavanvd/postgres-xl,zeroae/postgres-xl,greenplum-db/gpdb,ashwinstar/gpdb,50wu/gpdb,kmjungersen/PostgresXL,ovr/postgres-xl