[PATCH 0/6] emacs: Built-in help improvements and clean up doc strings

[Austin Clements]

The first three patches in this series simply fix some function
documentation string problems I found while making the other patches.
I'm marking them trivial because they don't affect any code.

The rest of this series improves a bunch of the built-in Emacs help,
accessed through `notmuch-help' (bound to "?" by default).  In
addition to improving some documentation strings, it introduces a new
facility to `notmuch-help' to explicitly specify interactive
documentation and documentation for prefixed commands.  For example,
where notmuch-help currently says

m       Invoke the notmuch mail composition window.

with this series, it says

m       Compose new mail.
C-u m   ... and prompt for sender

Feel free to point out commands I missed (or post patches for them).
I went through all bound commands in hello, search, and show, as well
as all prefixed commands, but didn't go through unbound, non-prefixed
commands.