Update pitr docs to mention inclusive/exclusive xid specification
Update pitr docs to mention inclusive/exclusive xid specification

rubikloud/gpdb,Quikling/gpdb,zeroae/postgres-xl,yuanzhao/gpdb,oberstet/postgres-xl,CraigHarris/gpdb,edespino/gpdb,Postgres-XL/Postgres-XL,chrishajas/gpdb,lisakowen/gpdb,edespino/gpdb,greenplum-db/gpdb,rubikloud/gpdb,kmjungersen/PostgresXL,0x0FFF/gpdb,edespino/gpdb,zeroae/postgres-xl,ashwinstar/gpdb,ashwinstar/gpdb,ashwinstar/gpdb,yuanzhao/gpdb,kaknikhil/gpdb,Chibin/gpdb,rubikloud/gpdb,tangp3/gpdb,atris/gpdb,ashwinstar/gpdb,xuegang/gpdb,randomtask1155/gpdb,lisakowen/gpdb,xuegang/gpdb,ahachete/gpdb,rvs/gpdb,randomtask1155/gpdb,arcivanov/postgres-xl,atris/gpdb,pavanvd/postgres-xl,kaknikhil/gpdb,tangp3/gpdb,arcivanov/postgres-xl,cjcjameson/gpdb,xinzweb/gpdb,zaksoup/gpdb,ovr/postgres-xl,greenplum-db/gpdb,0x0FFF/gpdb,cjcjameson/gpdb,50wu/gpdb,cjcjameson/gpdb,ahachete/gpdb,foyzur/gpdb,zaksoup/gpdb,kmjungersen/PostgresXL,CraigHarris/gpdb,0x0FFF/gpdb,pavanvd/postgres-xl,greenplum-db/gpdb,Chibin/gpdb,chrishajas/gpdb,lpetrov-pivotal/gpdb,Postgres-XL/Postgres-XL,lpetrov-pivotal/gpdb,arcivanov/postgres-xl,postmind-net/postgres-xl,greenplum-db/gpdb,jmcatamney/gpdb,xuegang/gpdb,yazun/postgres-xl,oberstet/postgres-xl,lpetrov-pivotal/gpdb,jmcatamney/gpdb,janebeckman/gpdb,Postgres-XL/Postgres-XL,rvs/gpdb,postmind-net/postgres-xl,adam8157/gpdb,Chibin/gpdb,Chibin/gpdb,rvs/gpdb,zaksoup/gpdb,Quikling/gpdb,techdragon/Postgres-XL,adam8157/gpdb,tangp3/gpdb,janebeckman/gpdb,atris/gpdb,ashwinstar/gpdb,ovr/postgres-xl,techdragon/Postgres-XL,Quikling/gpdb,kaknikhil/gpdb,xinzweb/gpdb,lintzc/gpdb,rubikloud/gpdb,jmcatamney/gpdb,zaksoup/gpdb,lisakowen/gpdb,Chibin/gpdb,rubikloud/gpdb,kaknikhil/gpdb,royc1/gpdb,snaga/postgres-xl,tangp3/gpdb,Quikling/gpdb,royc1/gpdb,50wu/gpdb,adam8157/gpdb,janebeckman/gpdb,atris/gpdb,atris/gpdb,yuanzhao/gpdb,lisakowen/gpdb,lpetrov-pivotal/gpdb,Postgres-XL/Postgres-XL,0x0FFF/gpdb,ovr/postgres-xl,snaga/postgres-xl,oberstet/postgres-xl,xuegang/gpdb,tangp3/gpdb,Postgres-XL/Postgres-XL,adam8157/gpdb,zaksoup/gpdb,Quikling/gpdb,snaga/postgres-xl,janebeckman/gpdb,royc1/gpdb,kaknikhil/gpdb,Chibin/gpdb,techdragon/Postgres-XL,lintzc/gpdb,lintzc/gpdb,royc1/gpdb,xuegang/gpdb,xinzweb/gpdb,50wu/gpdb,cjcjameson/gpdb,kmjungersen/PostgresXL,50wu/gpdb,kaknikhil/gpdb,Chibin/gpdb,zaksoup/gpdb,atris/gpdb,rvs/gpdb,janebeckman/gpdb,Quikling/gpdb,rvs/gpdb,lintzc/gpdb,chrishajas/gpdb,postmind-net/postgres-xl,ovr/postgres-xl,chrishajas/gpdb,rvs/gpdb,yuanzhao/gpdb,foyzur/gpdb,edespino/gpdb,yazun/postgres-xl,ahachete/gpdb,techdragon/Postgres-XL,edespino/gpdb,jmcatamney/gpdb,zeroae/postgres-xl,rubikloud/gpdb,randomtask1155/gpdb,kaknikhil/gpdb,lintzc/gpdb,chrishajas/gpdb,janebeckman/gpdb,chrishajas/gpdb,foyzur/gpdb,foyzur/gpdb,foyzur/gpdb,0x0FFF/gpdb,jmcatamney/gpdb,jmcatamney/gpdb,Chibin/gpdb,yazun/postgres-xl,randomtask1155/gpdb,cjcjameson/gpdb,yuanzhao/gpdb,oberstet/postgres-xl,yuanzhao/gpdb,0x0FFF/gpdb,yuanzhao/gpdb,rvs/gpdb,50wu/gpdb,CraigHarris/gpdb,kmjungersen/PostgresXL,50wu/gpdb,snaga/postgres-xl,CraigHarris/gpdb,arcivanov/postgres-xl,adam8157/gpdb,ahachete/gpdb,randomtask1155/gpdb,postmind-net/postgres-xl,tpostgres-projects/tPostgres,lpetrov-pivotal/gpdb,tangp3/gpdb,royc1/gpdb,rvs/gpdb,xinzweb/gpdb,zeroae/postgres-xl,kmjungersen/PostgresXL,kaknikhil/gpdb,edespino/gpdb,yuanzhao/gpdb,oberstet/postgres-xl,jmcatamney/gpdb,lpetrov-pivotal/gpdb,zaksoup/gpdb,greenplum-db/gpdb,xuegang/gpdb,atris/gpdb,yuanzhao/gpdb,tpostgres-projects/tPostgres,lintzc/gpdb,Quikling/gpdb,greenplum-db/gpdb,ovr/postgres-xl,50wu/gpdb,rvs/gpdb,adam8157/gpdb,Quikling/gpdb,pavanvd/postgres-xl,xinzweb/gpdb,CraigHarris/gpdb,royc1/gpdb,lpetrov-pivotal/gpdb,techdragon/Postgres-XL,lpetrov-pivotal/gpdb,0x0FFF/gpdb,greenplum-db/gpdb,cjcjameson/gpdb,lintzc/gpdb,zeroae/postgres-xl,rvs/gpdb,CraigHarris/gpdb,yazun/postgres-xl,pavanvd/postgres-xl,atris/gpdb,lisakowen/gpdb,ashwinstar/gpdb,foyzur/gpdb,CraigHarris/gpdb,CraigHarris/gpdb,Chibin/gpdb,yuanzhao/gpdb,Quikling/gpdb,yazun/postgres-xl,cjcjameson/gpdb,royc1/gpdb,rubikloud/gpdb,ahachete/gpdb,Quikling/gpdb,randomtask1155/gpdb,50wu/gpdb,0x0FFF/gpdb,janebeckman/gpdb,lisakowen/gpdb,lisakowen/gpdb,edespino/gpdb,jmcatamney/gpdb,tangp3/gpdb,lintzc/gpdb,Chibin/gpdb,arcivanov/postgres-xl,chrishajas/gpdb,xuegang/gpdb,ahachete/gpdb,janebeckman/gpdb,arcivanov/postgres-xl,zaksoup/gpdb,edespino/gpdb,xinzweb/gpdb,tpostgres-projects/tPostgres,kaknikhil/gpdb,xinzweb/gpdb,foyzur/gpdb,rubikloud/gpdb,randomtask1155/gpdb,CraigHarris/gpdb,ahachete/gpdb,adam8157/gpdb,janebeckman/gpdb,ashwinstar/gpdb,janebeckman/gpdb,postmind-net/postgres-xl,edespino/gpdb,ahachete/gpdb,tpostgres-projects/tPostgres,pavanvd/postgres-xl,greenplum-db/gpdb,kaknikhil/gpdb,tpostgres-projects/tPostgres,cjcjameson/gpdb,xinzweb/gpdb,foyzur/gpdb,xuegang/gpdb,edespino/gpdb,randomtask1155/gpdb,lintzc/gpdb,royc1/gpdb,lisakowen/gpdb,snaga/postgres-xl,ashwinstar/gpdb,cjcjameson/gpdb,chrishajas/gpdb,tangp3/gpdb,adam8157/gpdb,xuegang/gpdb,cjcjameson/gpdb