Reduce use of @email in doc/misc

Reduce use of @email in doc/misc

In many cases it serves no purpose.  It gets converted to mailto:
in html output, which is mainly just an invitation to get spam.

* doc/misc/erc.texi (Special Features): Update contact information.
(History): Avoid using @email.

* doc/misc/eshell.texi (Bugs and ideas): Minor updates.

* doc/misc/faq.texi (Reporting bugs, Origin of the term Emacs)
(Setting up a customization file)
(Using an already running Emacs process, Turning off beeping)
(Packages that do not come with Emacs)
(Replying to the sender of a message): Avoid using @email.

* doc/misc/pcl-cvs.texi (Contributors, Bugs): Avoid using @email.

* doc/misc/reftex.texi (Imprint): Avoid using @email.

* doc/misc/ses.texi (Top): Update bug reporting instructions.
(Acknowledgments): Avoid using @email.

* doc/misc/woman.texi (Introduction, Background): Remove outdated information.
(Bugs, Acknowledgments): Avoid using @email.