[NTG-context] Documentation for the letter module

Hi! Where can the current documentation for the letter module be found? I seems like it's not included in the distribution (why is it missing?) and http://bitbucket.org/wolfs/correspondence/downloads/correspondence.pdf is (out)dated: 2010-08-27 Furthermore, the latest updates on http://bitbucket.org/wolfs/correspondence/ are from 2012-02-02 and the module seems to have been updated¹ since (2015-08-24). Marco ¹ https://modules.contextgarden.net/cgi-bin/module.cgi/ruid=5489253982/action=...