* doc/lispref/customize.texi (Common Keywords): Correct what
missing :group means.
@item :group @var{group}
Put this customization item in group @var{group}. If this keyword is
missing from a customization item, it'll be placed in the same group
-as the previous customization item that had a @code{:group} spec (in
-the same file).
+that was last defined (in the current file).
When you use @code{:group} in a @code{defgroup}, it makes the new
group a subgroup of @var{group}.