Add another link of a GUC variable to where it is explained.
Add another link of a GUC variable to where it is explained.

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