This commit does:

- get rid of the garbage code for unused --print-parse-wal option.
- add help message for --quiet option into usage().
- fix typo of option name in help message.

Author: Fujii Masao
Reviewed-by: Robert Haas
Discussion: https://postgr.es/m/ff4710f7-2331-4f6b-012e-d76da3275e91@oss.nttdata.com