hgrc.5: mention lists as well

doc/hgrc.5.txt

@@ -110,10 +110,10 b' the configuration file in which the ``%i'
 A line with ``%unset name`` will remove ``name`` from the current
 section, if it has been set previously.
 
-The values are either free-form text strings or Boolean values.
-Boolean values can be set to true using any of "1", "yes", "true", or
-"on" and to false using "0", "no", "false", or "off" (all case
-insensitive).
+The values are either free-form text strings, lists of text strings,
+or Boolean values. Lists are split on whitespace and commas. Boolean
+values can be set to true using any of "1", "yes", "true", or "on" and
+to false using "0", "no", "false", or "off" (all case insensitive).
 
 
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