Remove references to obsolete libraries

* doc/emacs/cmdargs.texi (General Variables):
* doc/lispintro/emacs-lisp-intro.texi (Lisp History):
* doc/lispref/processes.texi (Network):
* doc/misc/gnus-coding.texi (Gnus Coding Style):
* doc/misc/gnus.texi (Oort Gnus):
* doc/misc/smtpmail.texi (Encryption): Remove references to obsolete
libraries.  (Bug#37964)

1 files changed, 5 insertions, 8 deletions

diff --git a/doc/lispref/processes.texi b/doc/lispref/processes.texi
index 6970f718ee0..f515213615e 100644
--- a/doc/lispref/processes.texi
+++ b/doc/lispref/processes.texi
@@ -2426,18 +2426,15 @@ server is stopped; a non-@code{nil} value means yes.
 @cindex encrypted network connections
 @cindex @acronym{TLS} network connections
 @cindex @acronym{STARTTLS} network connections
-Emacs can create encrypted network connections, using either built-in
-or external support.  The built-in support uses the GnuTLS
-Transport Layer Security Library; see
+Emacs can create encrypted network connections, using the built-in
+support for the GnuTLS Transport Layer Security Library; see
 @uref{https://www.gnu.org/software/gnutls/, the GnuTLS project page}.
 If your Emacs was compiled with GnuTLS support, the function
 @code{gnutls-available-p} is defined and returns non-@code{nil}.  For
 more details, @pxref{Top,, Overview, emacs-gnutls, The Emacs-GnuTLS manual}.
-The external support uses the @file{starttls.el} library, which
-requires a helper utility such as @command{gnutls-cli} to be installed
-on the system.  The @code{open-network-stream} function can
-transparently handle the details of creating encrypted connections for
-you, using whatever support is available.
+The @code{open-network-stream} function can transparently handle the
+details of creating encrypted connections for you, using whatever
+support is available.
 
 @defun open-network-stream name buffer host service &rest parameters
 This function opens a TCP connection, with optional encryption, and