[PATCH v3 5/5] Update documentation

[David Bremner]

Todd <todd at electricoding.com> writes:

> +  The new `mimetype:` search prefix allows searching for the
> +  content-type of attachments, which is now indexed by `notmuch
> +  insert`. See the `notmuch-search-terms` manual page for detai

it strikes me as odd to single out notmuch-insert here, since mimetypes
are also indexed by notmuch-new (on new messages). 

>  
> +-  mimetype:<word>
> +

I'm curious what other people think, but my personal preference would be
for the mimetype: docs to more closely match the subject: docs, since
that's how they work.