Add "Communication Method" row to HA feature matrix documentation.
Add "Communication Method" row to HA feature matrix documentation.

ashwinstar/gpdb,royc1/gpdb,janebeckman/gpdb,lintzc/gpdb,Quikling/gpdb,royc1/gpdb,janebeckman/gpdb,pavanvd/postgres-xl,cjcjameson/gpdb,kaknikhil/gpdb,cjcjameson/gpdb,rvs/gpdb,zaksoup/gpdb,Chibin/gpdb,rvs/gpdb,Quikling/gpdb,postmind-net/postgres-xl,greenplum-db/gpdb,0x0FFF/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,Chibin/gpdb,50wu/gpdb,ashwinstar/gpdb,Chibin/gpdb,snaga/postgres-xl,techdragon/Postgres-XL,Quikling/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,tpostgres-projects/tPostgres,50wu/gpdb,Postgres-XL/Postgres-XL,xinzweb/gpdb,rvs/gpdb,jmcatamney/gpdb,edespino/gpdb,Postgres-XL/Postgres-XL,greenplum-db/gpdb,lintzc/gpdb,Chibin/gpdb,xuegang/gpdb,kaknikhil/gpdb,lisakowen/gpdb,yuanzhao/gpdb,jmcatamney/gpdb,0x0FFF/gpdb,edespino/gpdb,kaknikhil/gpdb,yazun/postgres-xl,techdragon/Postgres-XL,Chibin/gpdb,ovr/postgres-xl,ashwinstar/gpdb,chrishajas/gpdb,zaksoup/gpdb,edespino/gpdb,lintzc/gpdb,oberstet/postgres-xl,oberstet/postgres-xl,pavanvd/postgres-xl,cjcjameson/gpdb,xuegang/gpdb,greenplum-db/gpdb,Quikling/gpdb,tpostgres-projects/tPostgres,adam8157/gpdb,ovr/postgres-xl,jmcatamney/gpdb,royc1/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,chrishajas/gpdb,edespino/gpdb,yuanzhao/gpdb,chrishajas/gpdb,greenplum-db/gpdb,rvs/gpdb,postmind-net/postgres-xl,xinzweb/gpdb,arcivanov/postgres-xl,ovr/postgres-xl,cjcjameson/gpdb,lisakowen/gpdb,jmcatamney/gpdb,kmjungersen/PostgresXL,zaksoup/gpdb,xinzweb/gpdb,CraigHarris/gpdb,kmjungersen/PostgresXL,adam8157/gpdb,snaga/postgres-xl,xuegang/gpdb,Quikling/gpdb,0x0FFF/gpdb,0x0FFF/gpdb,pavanvd/postgres-xl,jmcatamney/gpdb,postmind-net/postgres-xl,Chibin/gpdb,lintzc/gpdb,jmcatamney/gpdb,rvs/gpdb,ahachete/gpdb,yuanzhao/gpdb,ahachete/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,CraigHarris/gpdb,lisakowen/gpdb,royc1/gpdb,xuegang/gpdb,janebeckman/gpdb,xinzweb/gpdb,janebeckman/gpdb,CraigHarris/gpdb,50wu/gpdb,snaga/postgres-xl,xuegang/gpdb,CraigHarris/gpdb,pavanvd/postgres-xl,adam8157/gpdb,ashwinstar/gpdb,janebeckman/gpdb,0x0FFF/gpdb,xinzweb/gpdb,lintzc/gpdb,royc1/gpdb,jmcatamney/gpdb,ahachete/gpdb,edespino/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,janebeckman/gpdb,arcivanov/postgres-xl,kaknikhil/gpdb,chrishajas/gpdb,CraigHarris/gpdb,royc1/gpdb,zaksoup/gpdb,janebeckman/gpdb,kmjungersen/PostgresXL,CraigHarris/gpdb,50wu/gpdb,lintzc/gpdb,zaksoup/gpdb,0x0FFF/gpdb,zaksoup/gpdb,rvs/gpdb,chrishajas/gpdb,rvs/gpdb,zeroae/postgres-xl,xuegang/gpdb,lintzc/gpdb,Quikling/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,kaknikhil/gpdb,yazun/postgres-xl,rvs/gpdb,xuegang/gpdb,ashwinstar/gpdb,lintzc/gpdb,ahachete/gpdb,0x0FFF/gpdb,royc1/gpdb,xuegang/gpdb,tpostgres-projects/tPostgres,ahachete/gpdb,CraigHarris/gpdb,Chibin/gpdb,50wu/gpdb,rvs/gpdb,50wu/gpdb,ashwinstar/gpdb,Quikling/gpdb,arcivanov/postgres-xl,ahachete/gpdb,greenplum-db/gpdb,zaksoup/gpdb,snaga/postgres-xl,lisakowen/gpdb,adam8157/gpdb,edespino/gpdb,arcivanov/postgres-xl,ahachete/gpdb,yuanzhao/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,xinzweb/gpdb,cjcjameson/gpdb,adam8157/gpdb,Postgres-XL/Postgres-XL,Chibin/gpdb,jmcatamney/gpdb,lisakowen/gpdb,janebeckman/gpdb,kaknikhil/gpdb,kaknikhil/gpdb,chrishajas/gpdb,edespino/gpdb,Quikling/gpdb,techdragon/Postgres-XL,ovr/postgres-xl,royc1/gpdb,ahachete/gpdb,kmjungersen/PostgresXL,oberstet/postgres-xl,50wu/gpdb,kaknikhil/gpdb,edespino/gpdb,oberstet/postgres-xl,Quikling/gpdb,tpostgres-projects/tPostgres,CraigHarris/gpdb,lisakowen/gpdb,greenplum-db/gpdb,zeroae/postgres-xl,lisakowen/gpdb,janebeckman/gpdb,50wu/gpdb,yazun/postgres-xl,greenplum-db/gpdb,xinzweb/gpdb,postmind-net/postgres-xl,kmjungersen/PostgresXL,cjcjameson/gpdb,oberstet/postgres-xl,ashwinstar/gpdb,postmind-net/postgres-xl,Postgres-XL/Postgres-XL,Quikling/gpdb,xinzweb/gpdb,techdragon/Postgres-XL,edespino/gpdb,adam8157/gpdb,zeroae/postgres-xl,xuegang/gpdb,ovr/postgres-xl,Chibin/gpdb,cjcjameson/gpdb,adam8157/gpdb,adam8157/gpdb,arcivanov/postgres-xl,yuanzhao/gpdb,zaksoup/gpdb,pavanvd/postgres-xl,Postgres-XL/Postgres-XL,lintzc/gpdb,rvs/gpdb,Chibin/gpdb,yazun/postgres-xl,edespino/gpdb,kaknikhil/gpdb,chrishajas/gpdb,lisakowen/gpdb,snaga/postgres-xl,kaknikhil/gpdb,CraigHarris/gpdb,yazun/postgres-xl,janebeckman/gpdb,techdragon/Postgres-XL,chrishajas/gpdb,tpostgres-projects/tPostgres