Release mh-e-doc-1.3 for Emacs 21.1.

Release mh-e-doc-1.3 for Emacs 21.1.
		(Viewing): Added mh-header-display index entry.
		(Organizing,Customizing Reading): Added mh-kill-folder index entry.
		(Preface): The current version of mh-e has come
		standard since 19.29. Since Version 5 of mh-e has been out so
		long, lots of text regarding earlier versions was pruned.
		(Conventions): Use BACKSPACE instead of DELETE in Emacs 21.
		(Reading MIME): Use nmh commands.
		(Bug Reports): Current maintainer now Bill Wohler. Bug reports now
		at SourceForge.
		(Mailing List): Mailing lists now at SourceForge.
		(MH FAQ): FAQ now at faqs.org.
		(Getting mh-e): Version in Emacs should be fairly up to date. New
		releases at SourceForge.
		(History): mh-e now maintained by Bill Wohler at SourceForge.
		(Changes to mh-e): Gone.
		(Copying): Clean up close-quote punctuation (rms-1.7).