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, 2 insertions, 2 deletions

diff --git a/etc/ERC-NEWS b/etc/ERC-NEWS
index d0d84d0a987..76439f1d068 100644
--- a/etc/ERC-NEWS
+++ b/etc/ERC-NEWS
@@ -45,8 +45,8 @@ With the overhaul of the services module temporarily shelved and the
 transition to SASL-based authentication still underway, users may feel
 left in the lurch to endure yet another release cycle of backtick
 hell.  For some, auth-source may provide a workaround in the form of
-nonstandard server passwords.  See the "Connection" node in the manual
-under the subheading "Password".
+nonstandard server passwords.  See the section titled "auth-source" in
+the Integrations chapter of ERC's manual.
 
 ** Rudimentary SASL support has arrived.
 A new module, 'erc-sasl', now ships with ERC 5.5.  See the SASL