bug#15917: 24.3.50; manual: mention keys reserved for users

[Lars Ingebrigtsen]

Eli Zaretskii <eliz@gnu.org> writes:

> That'd be fine with me, but should we perhaps clarify what is a
> "letter" in this context?  Are we talking about ASCII letters only, or
> are non-ASCII letters also included?

Good question.  I assumed that this was about ASCII letters only, but
thinking about it, I don't see why: I think we should reserve all `C-c
LETTER' key sequences for the users.

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