emacs-29 34bbb6c8d21: Document NonGNU ELPA in FAQ

[Stefan Kangas]

branch: emacs-29
commit 34bbb6c8d2198b73327df3680cfd596631601505
Author: Stefan Kangas <stefankangas@gmail.com>
Commit: Stefan Kangas <stefankangas@gmail.com>

    Document NonGNU ELPA in FAQ
    
    * doc/misc/efaq.texi (Packages that do not come with Emacs):
    Document NonGNU ELPA.  (Bug#65818)
---
 doc/misc/efaq.texi | 39 +++++++++++++++++++++++++--------------
 1 file changed, 25 insertions(+), 14 deletions(-)

diff --git a/doc/misc/efaq.texi b/doc/misc/efaq.texi
index 0a0c375d273..db754a6dd0d 100644
--- a/doc/misc/efaq.texi
+++ b/doc/misc/efaq.texi
@@ -3839,13 +3839,28 @@ description of what they do and how they should be used.
 
 The easiest way to add more features to your Emacs is to use the
 command @kbd{M-x list-packages}.  This contacts the
-@uref{https://elpa.gnu.org, GNU ELPA} (``Emacs Lisp Package Archive'')
-server and fetches the list of additional packages that it offers.
-These are GNU packages that are available for use with Emacs, but are
-distributed separately from Emacs itself, for reasons of space, etc.
-You can browse the resulting @file{*Packages*} buffer to see what is
-available, and then Emacs can automatically download and install the
-packages that you select.  @xref{Packages,,, emacs, The GNU Emacs Manual}.
+@uref{https://elpa.gnu.org, GNU ELPA} and
+@uref{https://elpa.nongnu.org, NonGNU ELPA} (``Emacs Lisp Package
+Archive'') servers and fetches the list of additional packages that
+they offer.  You can browse the resulting @file{*Packages*} buffer to
+see what is available, and then Emacs can automatically download and
+install the packages that you select.  @xref{Packages,,, emacs, The
+GNU Emacs Manual}.
+
+GNU ELPA contains GNU packages that are available for use with Emacs,
+but are distributed separately from Emacs itself, for reasons of
+space, etc.  NonGNU ELPA contains a selection of third-party packages
+that can not be included in GNU ELPA because their copyright has not
+yet been assigned to the Free Software Foundation.@footnote{For more
+information, see @uref{https://www.gnu.org/licenses/why-assign.html,
+Why the FSF Gets Copyright Assignments from Contributors}.}
+
+The @uref{https://lists.gnu.org/mailman/listinfo/gnu-emacs-sources,
+GNU Emacs sources mailing list} is automatically sent an email when a
+new version of a GNU ELPA or NonGNU ELPA package is
+released.@footnote{It used to be an official place where people could
+post or announce their extensions to Emacs.  That is still allowed,
+but exceedingly rare these days.}
 
 There are other Emacs Lisp package archives.  To use additional
 archives, you can customize the @code{package-archives} variable.
@@ -3855,23 +3870,19 @@ correctness and safety of the code, or they may give 
only cursory
 attention.
 
 Also, packages hosted on these other archives may encourage or require
-you to install and use other nonfree programs.  Unless you can verify
+you to install and use nonfree programs.  Unless you can verify
 that a package is free software, and that it functions without
 installing any nonfree software, we recommend for your freedom's sake
 that you stay away from it.
 
-The @uref{https://lists.gnu.org/mailman/listinfo/gnu-emacs-sources,
-GNU Emacs sources mailing list} is an official place where people can
-post or announce their extensions to Emacs.
-
 The @uref{https://emacswiki.org, Emacs Wiki} contains pointers to some
 additional extensions.  @uref{https://wikemacs.org, WikEmacs} is an
 alternative wiki for Emacs.
 
 It is impossible for us to list here all the sites that offer Emacs
 Lisp packages.  If you are interested in a specific feature, then
-after checking Emacs itself and GNU ELPA, a web search is often the
-best way to find results.
+after checking Emacs itself, GNU ELPA, and NonGNU ELPA, a web search
+is often the best way to find results.
 
 @node Spell-checkers
 @section Spell-checkers