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)

3 files changed, 5 insertions, 30 deletions

diff --git a/doc/misc/gnus-coding.texi b/doc/misc/gnus-coding.texi
index 55320bf4c32..9a14a95f797 100644
--- a/doc/misc/gnus-coding.texi
+++ b/doc/misc/gnus-coding.texi
@@ -96,16 +96,6 @@ Read passwords from user, possibly using a password cache.
 @c As of 2005-10-21...
 There are no Gnus dependencies in this file.
 
-@item tls.el
-TLS/SSL support via wrapper around GnuTLS
-@c As of 2005-10-21...
-There are no Gnus dependencies in this file.
-
-@item pgg*.el
-Glue for the various PGP implementations.
-@c As of 2005-10-21...
-There are no Gnus dependencies in these files.
-
 @item sha1.el
 SHA1 Secure Hash Algorithm.
 @c As of 2007-08-25...
diff --git a/doc/misc/gnus.texi b/doc/misc/gnus.texi
index 83641feeb56..5ec1f022d45 100644
--- a/doc/misc/gnus.texi
+++ b/doc/misc/gnus.texi
@@ -27910,7 +27910,7 @@ The revised Gnus @acronym{FAQ} is included in the manual,
 @acronym{TLS} wrapper shipped with Gnus
 
 @acronym{TLS}/@acronym{SSL} is now supported in @acronym{IMAP} and
-@acronym{NNTP} via @file{tls.el} and GnuTLS.
+@acronym{NNTP} via GnuTLS.
 
 @item
 Improved anti-spam features.
diff --git a/doc/misc/smtpmail.texi b/doc/misc/smtpmail.texi
index 99612d5c8fb..f29a5a82e86 100644
--- a/doc/misc/smtpmail.texi
+++ b/doc/misc/smtpmail.texi
@@ -295,26 +295,11 @@ encrypted connection if the server supports it.  Other possible values
 are: @code{starttls} to insist on STARTTLS; @code{ssl} to use TLS/SSL;
 and @code{plain} for no encryption.
 
-Use of any form of TLS/SSL requires support in Emacs.  You can either
-use the built-in support (in Emacs 24.1 and later), or the
-@file{starttls.el} Lisp library.  The built-in support uses the GnuTLS
-@footnote{@url{https://www.gnu.org/software/gnutls/}} library.
-If your Emacs has GnuTLS support built-in, the function
+Use of any form of TLS/SSL requires support in Emacs.  You can use the
+built-in support for the GnuTLS
+@footnote{@url{https://www.gnu.org/software/gnutls/}} library.  If your
+Emacs has GnuTLS support built-in, the function
 @code{gnutls-available-p} is defined and returns non-@code{nil}.
-Otherwise, you must use the @file{starttls.el} library (see that file for
-more information on customization options, etc.).  The Lisp library
-requires one of the following external tools to be installed:
-
-@enumerate
-@item
-The GnuTLS command line tool @samp{gnutls-cli}, which you can get from
-@url{https://www.gnu.org/software/gnutls/}.  This is the recommended
-tool, mainly because it can verify server certificates.
-
-@item
-The @samp{starttls} external program, which you can get from
-@file{starttls-*.tar.gz} from @uref{ftp://ftp.opaopa.org/pub/elisp/}.
-@end enumerate
 
 @cindex certificates
 @cindex keys