Document commas in kernel arguments

- Closes: #1679

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## v4.6.0, unreleased
 
+### Added
+
+- Document defining kernel args that include commas. #1679
+
 ### Fixed
 
 - Fix default nodes.conf to use the new kernel command line list format. #1670

userdocs/contents/nodeconfig.rst

@@ -128,7 +128,7 @@ see a list of all configuration attributes, use the command ``wwctl
 node set --help``.
 
 Configuring the Node's Image
-============================
+----------------------------
 
 .. code-block:: console
 
@@ -294,6 +294,18 @@ nodes are sorted lexically, first by cluster, then by ID.)
 Once a node has been discovered its "discoverable" flag is
 automatically cleared.
 
+Setting list values
+===================
+
+Some node fields, such as overlays and kernel args, accept a list of values.
+These may be specified as a comma-separated list or as multiple arguments.
+
+To include an explicit comma in the value, enclose the value in inner-quotes.
+
+.. code-block:: console
+
+   # wwctl profile set default --kernelargs 'quiet,crashkernel=no,nosplash' --kernelargs='"console=ttyS0,115200"'
+
 Un-setting Node Attributes
 ==========================