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)

6 files changed, 11 insertions, 45 deletions

diff --git a/doc/emacs/cmdargs.texi b/doc/emacs/cmdargs.texi
index d3fda285f26..9303b0b8dd1 100644
--- a/doc/emacs/cmdargs.texi
+++ b/doc/emacs/cmdargs.texi
@@ -565,12 +565,6 @@ is found there.
 @item HOSTNAME
 @vindex HOSTNAME@r{, environment variable}
 The name of the machine that Emacs is running on.
-@c complete.el is obsolete since 24.1.
-@ignore
-@item INCPATH
-A colon-separated list of directories.  Used by the @code{complete} package
-to search for files.
-@end ignore
 @item INFOPATH
 @vindex INFOPATH@r{, environment variable}
 A colon-separated list of directories in which to search for Info files.
diff --git a/doc/lispintro/emacs-lisp-intro.texi b/doc/lispintro/emacs-lisp-intro.texi
index 87152f49d6f..a6f4b6829f1 100644
--- a/doc/lispintro/emacs-lisp-intro.texi
+++ b/doc/lispintro/emacs-lisp-intro.texi
@@ -929,7 +929,7 @@ GNU Emacs Lisp is largely inspired by Maclisp, which was written at MIT
 in the 1960s.  It is somewhat inspired by Common Lisp, which became a
 standard in the 1980s.  However, Emacs Lisp is much simpler than Common
 Lisp.  (The standard Emacs distribution contains an optional extensions
-file, @file{cl.el}, that adds many Common Lisp features to Emacs Lisp.)
+file, @file{cl-lib.el}, that adds many Common Lisp features to Emacs Lisp.)
 
 @node Note for Novices
 @unnumberedsec A Note for Novices
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
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