Clarify plpgsql documentation by not treating IF THEN ELSE IF ... as a truly distinct version of IF.  Per suggestion from Marko Kreen.
Clarify plpgsql documentation by not treating IF THEN ELSE IF ... as a
truly distinct version of IF.  Per suggestion from Marko Kreen.

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