pgsql: Small cleanups of contrib --help output

Small cleanups of contrib --help output

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/510860a6a5e4b66091353e7b0d619f71f6bec789

Modified Files
--------------
contrib/pg_archivecleanup/pg_archivecleanup.c | 10 +++++-----
contrib/pg_standby/pg_standby.c | 6 +++---
contrib/pgbench/pgbench.c | 2 +-
3 files changed, 9 insertions(+), 9 deletions(-)