gpperfmon: fix typo
gpperfmon: fix typo

Signed-off-by: Marbin Tan <fe9db60e23a06449b90b19d66b721708068089ad@pivotal.io>

adam8157/gpdb,janebeckman/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,greenplum-db/gpdb,jmcatamney/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,ashwinstar/gpdb,edespino/gpdb,cjcjameson/gpdb,edespino/gpdb,Quikling/gpdb,xinzweb/gpdb,adam8157/gpdb,greenplum-db/gpdb,adam8157/gpdb,lisakowen/gpdb,Quikling/gpdb,Chibin/gpdb,adam8157/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,jmcatamney/gpdb,Quikling/gpdb,cjcjameson/gpdb,Chibin/gpdb,Chibin/gpdb,Chibin/gpdb,xinzweb/gpdb,kaknikhil/gpdb,adam8157/gpdb,greenplum-db/gpdb,yuanzhao/gpdb,Chibin/gpdb,Chibin/gpdb,cjcjameson/gpdb,rvs/gpdb,xinzweb/gpdb,Quikling/gpdb,janebeckman/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,janebeckman/gpdb,edespino/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,lisakowen/gpdb,jmcatamney/gpdb,lisakowen/gpdb,50wu/gpdb,rvs/gpdb,ashwinstar/gpdb,edespino/gpdb,50wu/gpdb,cjcjameson/gpdb,adam8157/gpdb,Chibin/gpdb,greenplum-db/gpdb,edespino/gpdb,adam8157/gpdb,edespino/gpdb,lisakowen/gpdb,ashwinstar/gpdb,rvs/gpdb,Quikling/gpdb,janebeckman/gpdb,kaknikhil/gpdb,rvs/gpdb,rvs/gpdb,janebeckman/gpdb,jmcatamney/gpdb,adam8157/gpdb,50wu/gpdb,janebeckman/gpdb,Quikling/gpdb,janebeckman/gpdb,50wu/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,lisakowen/gpdb,yuanzhao/gpdb,ashwinstar/gpdb,kaknikhil/gpdb,yuanzhao/gpdb,janebeckman/gpdb,janebeckman/gpdb,rvs/gpdb,xinzweb/gpdb,50wu/gpdb,Chibin/gpdb,lisakowen/gpdb,Quikling/gpdb,Quikling/gpdb,rvs/gpdb,cjcjameson/gpdb,rvs/gpdb,Quikling/gpdb,xinzweb/gpdb,rvs/gpdb,edespino/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,xinzweb/gpdb,yuanzhao/gpdb,xinzweb/gpdb,cjcjameson/gpdb,Quikling/gpdb,yuanzhao/gpdb,50wu/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,Chibin/gpdb,50wu/gpdb,cjcjameson/gpdb,kaknikhil/gpdb,ashwinstar/gpdb,lisakowen/gpdb,edespino/gpdb,jmcatamney/gpdb,50wu/gpdb,ashwinstar/gpdb,rvs/gpdb,yuanzhao/gpdb,edespino/gpdb,kaknikhil/gpdb,greenplum-db/gpdb,ashwinstar/gpdb,greenplum-db/gpdb,janebeckman/gpdb,xinzweb/gpdb,lisakowen/gpdb,edespino/gpdb,Chibin/gpdb,cjcjameson/gpdb