Remove obsolete comment.
Remove obsolete comment.

In earlier versions of the sync rep patch, waiters removed themselves from
the queue, but now walsender removes them before doing the wakeup.

Report by Fujii Masao.

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