Quoting fixes in lisp mail, mh-e, net, url

Quoting fixes in lisp mail, mh-e, net, url

* lisp/mail/emacsbug.el (report-emacs-bug)
(report-emacs-bug-hook): Use straight quotes in outgoing email,
* lisp/mail/feedmail.el (feedmail-message-action-help-blat):
* lisp/mail/rmail.el (rmail-unknown-mail-followup-to):
* lisp/mail/rmailout.el (rmail-output-read-file-name):
* lisp/net/imap.el (imap-interactive-login):
* lisp/net/tls.el (open-tls-stream):
* lisp/url/url-auth.el (url-register-auth-scheme):
Respect ‘text-quoting-style’ in diagnostics.
* lisp/mh-e/mh-e.el (mh-sortm-args):
Quote docstring example using text quotes, not as a Lisp quote.