Update example of process titles shown by "ps".
Update example of process titles shown by "ps".

This example was quite old: it lacked the WAL writer and autovac launcher
as well as the more recently added checkpointer.  Linux "ps" seems to show
slightly different stuff now too.

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