In docs, move PQrequestCancel() deprecation mention up to match other libpq doc mentions.
In docs, move PQrequestCancel() deprecation mention up to match other
libpq doc mentions.

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