More improvements for the Emacs manual

More improvements for the Emacs manual

* doc/emacs/programs.texi (Basic Indent, Comment Commands): Fix
typos.
* doc/emacs/text.texi (TeX Print, HTML Mode, Enriched Faces): Fix
typos.
* doc/emacs/help.texi (Help Files): Improve @uref usage.  Reported
by Stefan Kamphausen <stefan.kamphausen@acrolinx.com> in
emacs-manual-bugs@gnu.org.

* doc/emacs/fortran-xtra.texi (ForIndent Commands): Fix a typo.
(ForIndent Commands, Fortran Columns): Add empty lines between
@items in a @table.
(ForIndent Cont, ForIndent Num, Fortran Columns): Mention
'column-number-indicator-zero-based'.
(ForIndent Vars): Fix a typo.
(Fortran Comments): Fix punctuation.
(ForIndent Cont, Fortran Autofill): Fix markup of keyboard input.
* doc/emacs/programs.texi (Comments): Fix a typo.
(Comment Commands): More accurate description of the commands.
(Options for Comments): Don't mention "hook".
(Man Page): Prefer "M-x man" if available.
(Hideshow): Fix the command key sequence.
(Semantic): Update supported languages.
(Semantic, Hungry Delete, Other C Commands): Fix markup of
commands.
(Misc for Programs): Fix a typo.
(Electric C, Hungry Delete): More accurate description of
mode-line lighters of CC submodes.
(Asm Mode): Add empty lines between @items in a @table.
* doc/emacs/programs.texi (Program Modes): Add a few more modes.
Reported by Michael Albinus <michael.albinus@gmx.de> in
emacs-manual-bugs@gnu.org.

* doc/emacs/msdos.texi (Windows Misc): A minor rewording.
Suggested by Isaac Carter <icarter1391@gmail.com> in
emacs-manual-bugs@gnu.org.