Tweak documentation relating to 'erc-tls'

* doc/misc/erc.texi (Connecting): Add a reference to the auth manual.
* etc/NEWS: Remove the verbose, detailed example of client certificate
specification and refer to the ERC manual instead.
* lisp/erc/erc.el (erc-tls): Fix leftover path example in docstring.

doc/misc/erc.texi

@@ -588,6 +588,9 @@ line like the following to your authinfo file
 @example
 machine chat.freenode.net key /home/bandali/my-cert.key cert /home/bandali/my-cert.crt
 @end example
+
+See (info "(auth) Help for users") for more on the
+@file{.authinfo}/@file{.netrc} backend of @code{auth-source}.
 @end defun
 
 @subheading Server

etc/NEWS

@@ -1804,36 +1804,10 @@ activity overview sidebar for joined IRC channels is now part of ERC.
 The 'erc-tls' function has been updated to allow specifying a TLS
 client certificate for authentication, as an alternative to NickServ
 password-based authentication.  This is referred to as "CertFP" (short
-for Certificate Fingerprint) by several IRC networks.
-
-To use a certificate with 'erc-tls', specify the ':client-certificate'
-optional parameter, whose value should be as described in the
-documentation of 'open-network-stream': if non-nil, it should either
-be a list where the first element is the file name of the private key
-corresponding to a client certificate and the second element is the
-file name of the client certificate itself to use when connecting over
-TLS, or t, which means that 'auth-source' will be queried for the
-private key and the certificate.
-
-Examples of use:
-
-    (erc-tls :server "chat.freenode.net" :port 6697
-             :client-certificate
-             '("/home/bandali/my-cert.key"
-               "/home/bandali/my-cert.crt"))
-
-    (erc-tls :server "chat.freenode.net" :port 6697
-             :client-certificate
-             `(,(expand-file-name "~/cert-freenode.key")
-               ,(expand-file-name "~/cert-freenode.crt")))
-
-    (erc-tls :server "chat.freenode.net" :port 6697
-             :client-certificate t)
-
-In the case of ':client-certificate t', you will need to add a line
-like the following to your authinfo file (e.g. "~/.authinfo.gpg"):
-
-    machine chat.freenode.net key /home/bandali/my-cert.key cert /home/bandali/my-cert.crt
+for Certificate Fingerprint) by several IRC networks.  See the Info
+node "(erc) Connecting" in the ERC manual for more details and
+examples on how to specify and use TLS client certificates with
+'erc-tls'.
 
 ** Battery
 

lisp/erc/erc.el

@@ -2278,8 +2278,8 @@ Example usage:
 
     (erc-tls :server \"chat.freenode.net\" :port 6697
              :client-certificate
-             '(\"/data/bandali/my-cert.key\"
-               \"/data/bandali/my-cert.crt\"))"
+             '(\"/home/bandali/my-cert.key\"
+               \"/home/bandali/my-cert.crt\"))"
   (interactive (let ((erc-default-port erc-default-port-tls))
 		 (erc-select-read-args)))
   (let ((erc-server-connect-function 'erc-open-tls-stream))