[PATCH] emacs: Clarify that notmuch-poll-script is deprecated

[David Bremner]

Austin Clements <amdragon at MIT.EDU> writes:

> notmuch-poll-script has long since been deprecated in favor of
> post-new hooks, but this wasn't obvious from the documentation.
> Update the documentation to make this clear.  Since
> notmuch-poll-script could, to some extend, be used to control the path
> of the notmuch binary and that use is now clearly discouraged, promote
> notmuch-command to a real defcustom instead of just a variable.

pushed

d