Update release notes for  8.3.5, 8.2.11, and 8.1.15 to mention the need to reindex GiST indexes:
Update release notes for  8.3.5, 8.2.11, and 8.1.15 to mention the need
to reindex GiST indexes:

	If you were running a previous 8.X.X release, REINDEX all GiST
	indexes after the upgrade.

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