Add dedicated auth-source section in ERC manual

* doc/misc/erc.texi: Move auth-source description from the Password
subheading of the Advanced chapter's Connecting section to the new
Integrations section as a new node, Auth-Source, and give it a bit
more structure.  Fix various misuses of xref vs. pxref.  Convert URL
subheading to subsection and add anchor.  Prefer "backend" as a single
word, based on usage in other manuals.  Also replace loud "warning" in
SASL troubleshooting section.
* etc/ERC-NEWS: Re-link auth-source mention.
* lisp/erc/erc-sasl.el (erc-sasl-auth-source-function): Update info
node in doc string.
* lisp/erc/erc-services.el (erc-auth-source-services-function):
Re-link auth-source info node in doc string.
* lisp/erc/erc.el (erc-password, erc-auth-source-server-function,
erc-auth-source-join-function): Re-link auth-source info node in doc
strings.

1 files changed, 3 insertions, 3 deletions

diff --git a/lisp/erc/erc.el b/lisp/erc/erc.el
index 6bb2e013c3b..3b0cde41558 100644
--- a/lisp/erc/erc.el
+++ b/lisp/erc/erc.el
@@ -219,7 +219,7 @@ parameters and authentication."
 This variable only exists for legacy reasons.  It's not customizable and
 is limited to a single server password.  Users looking for similar
 functionality should consider auth-source instead.  See info
-node `(auth) Top' and info node `(erc) Connecting'.")
+node `(auth) Top' and info node `(erc) auth-source'.")
 
 (make-obsolete-variable 'erc-password "use auth-source instead" "29.1")
 
@@ -3208,7 +3208,7 @@ if any.  In return, ERC expects a string to send as the server
 password, or nil, to skip the \"PASS\" command completely.  An
 explicit `:password' argument to entry-point commands `erc' and
 `erc-tls' also inhibits lookup, as does setting this option to
-nil.  See info node `(erc) Connecting' for details."
+nil.  See info node `(erc) auth-source' for details."
   :package-version '(ERC . "5.4.1") ; FIXME update when publishing to ELPA
   :group 'erc
   :type '(choice (const erc-auth-source-search)
@@ -3223,7 +3223,7 @@ channel.  In return, ERC expects a string to use as the channel
 \"key\", or nil to just join the channel normally.  Setting the
 option itself to nil tells ERC to always forgo consulting
 auth-source for channel keys.  For more information, see info
-node `(erc) Connecting'."
+node `(erc) auth-source'."
   :package-version '(ERC . "5.4.1") ; FIXME update when publishing to ELPA
   :group 'erc
   :type '(choice (const erc-auth-source-search)