update man pages - merchant - Merchant backend to process payments, run by merchants

commit c243d382193a3dc3b33bb9e445adf58ba4f7b56f
parent 6b8eec259947e4ccd3a33083d198d60d467785a8
Author: Christian Grothoff <christian@grothoff.org>
Date:   Thu,  3 Apr 2025 11:54:35 +0200

update man pages

	merchant Merchant backend to process payments, run by merchants
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