Clean up the clean rules of the documentation
Clean up the clean rules of the documentation

Most things should be cleaned by "make clean", except the parts that are
shipped in the tarball.  These rules had gotten a bit out of whack after
the various restructurings of the documentation build rules.

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