update man pages - challenger - OAuth 2.0-based authentication service that validates user can receive messages at a certain address

commit 2c1c2335ab9ec9e2852d1a8938a3a7577ed41b2f
parent fe0e37cde1888f2f476cbe154ba1b85f4134927d
Author: Christian Grothoff <christian@grothoff.org>
Date:   Fri,  8 Sep 2023 20:15:27 +0200

update man pages

	challenger OAuth 2.0-based authentication service that validates user can receive messages at a certain address
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