If you want to suggest a change, please suggest it on the
firstname.lastname@example.org mailing list,
Patches are very welcome! However, it is also helpful to have comments like 'xyz isn't explained clearly in the docs, I think such an explanation would fit in section abc'. However, please be sure you've read all of the documentation before asking this. Also, if you make such a suggestion please be ready to read the edits that do get committed to Git to be sure the results answer your question.
The official distribution documentation is now provided online as well as in each downloaded source archive.
Cyrus imapd documentation is available here
Cyrus sasl documentation is available here