Fix file comment for test_rls_hooks.c
Fix file comment for test_rls_hooks.c

The file-level comment wasn't updated when it was copied from the shared
memory queue test module.  Fixed.

Noted by Dean Rasheed.

zeroae/postgres-xl,jmcatamney/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,adam8157/gpdb,greenplum-db/gpdb,adam8157/gpdb,pavanvd/postgres-xl,ovr/postgres-xl,lisakowen/gpdb,yazun/postgres-xl,xinzweb/gpdb,xinzweb/gpdb,zeroae/postgres-xl,lisakowen/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,Postgres-XL/Postgres-XL,lisakowen/gpdb,xinzweb/gpdb,jmcatamney/gpdb,50wu/gpdb,yazun/postgres-xl,50wu/gpdb,oberstet/postgres-xl,ashwinstar/gpdb,yazun/postgres-xl,zeroae/postgres-xl,xinzweb/gpdb,adam8157/gpdb,50wu/gpdb,greenplum-db/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,greenplum-db/gpdb,greenplum-db/gpdb,pavanvd/postgres-xl,greenplum-db/gpdb,adam8157/gpdb,xinzweb/gpdb,ovr/postgres-xl,adam8157/gpdb,oberstet/postgres-xl,ashwinstar/gpdb,xinzweb/gpdb,lisakowen/gpdb,Postgres-XL/Postgres-XL,greenplum-db/gpdb,xinzweb/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,yazun/postgres-xl,lisakowen/gpdb,adam8157/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,oberstet/postgres-xl,ovr/postgres-xl,adam8157/gpdb,ashwinstar/gpdb,xinzweb/gpdb,lisakowen/gpdb,techdragon/Postgres-XL,techdragon/Postgres-XL,jmcatamney/gpdb,ashwinstar/gpdb,Postgres-XL/Postgres-XL,ashwinstar/gpdb,50wu/gpdb,ashwinstar/gpdb,yazun/postgres-xl,pavanvd/postgres-xl,adam8157/gpdb,techdragon/Postgres-XL,lisakowen/gpdb,pavanvd/postgres-xl,jmcatamney/gpdb,oberstet/postgres-xl,50wu/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,Postgres-XL/Postgres-XL,zeroae/postgres-xl,pavanvd/postgres-xl,50wu/gpdb,50wu/gpdb,lisakowen/gpdb,oberstet/postgres-xl,50wu/gpdb