[BRLTTY] documentation issues

[Dave Mielke]

[quoted lines by Rich Morin on 2016/07/06 at 05:04 -0700]

>because no good deed goes unpunished, here are some more nits!

:-)

>If `tmux` uses the `screen` driver, this should be mentioned in the
>`screen` entry and cross-references in a separate entry.  If not,
>explain how `tmux` is supported.

I don't understand. For starters, what's tmux?

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