add note about unused argument for OIDCUnAutzAction auth
# "401" return HTTP 401 Unauthorized with optional text message if specified in <argument>
# "403" return HTTP 403 Forbidden with optional text message: NB: for Apache 2.4 this is controlled by the AuthzSendForbiddenOnFailure directive!
# "302" redirect to the URL specified in the <argument> parameter
-# "auth" redirect the user to the OpenID Connect Provider or Discovery page for authentication
+# "auth" redirect the user to the OpenID Connect Provider or Discovery page for authentication (<argument> is unused)
# Useful in Location/Directory/Proxy path contexts that need to do stepup authentication
# When not defined the default "401" is used.
#OIDCUnAutzAction [401|403|302|auth] [<argument>]
