Add debug example

積丹尼 Dan Jacobson <[email protected]> Thu, 18 Jan 2018 16:05:11 +0800

Newsgroups	gmane.comp.gnu.mailutils.bugs
Message-ID	<[email protected]>

(info "(mailutils) debugging") is great, except without any examples, no
one will know how to debug.

Give an example of how to enhance
$ mail
to turn debugging on.

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