text: Title: FAQ item "How do I consume a query string that has a JSON value?" is outdated
  Body: The default value of `falcon.RequestOptions.auto_parse_qs_csv` was changed to `False` in v2.0 and handled in https://github.com/falconry/falcon/issues/842 and https://github.com/falconry/falcon/pull/1318.
  
  The FAQ item https://falcon.readthedocs.io/en/stable/user/faq.html#how-do-i-consume-a-query-string-that-has-a-json-value assumes the old default value and needs an update.