* doc/misc/vhdl-mode.texi: General clean-up.
Set copyright to FSF (years based on vhdl-mode releases), add license.
Remove hand-written node pointers. Remove info re old Emacs versions.
Markup fixes.
(Getting Connected): Remove irrelevant info.
(Indentation Commands, Requirements): Remove empty/irrelevant nodes.
(Frequently Asked Questions): Electric indent is now enabled.