Update release notes for 7.3.5.
Update release notes for 7.3.5.

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