Document indented for org-tags-match-list-sublevels

Thanks to Samuel Wales.

lisp/ChangeLog

@@ -3,6 +3,8 @@
 	* org.el (org-special-ctrl-a/e): Explicitely bind the value
 	'reversed for this option to the "true line boundary first"
 	behavior.
+	(org-tags-match-list-sublevels): Document the 'indented value for
+	this variable.
 
 	* org-latex.el (org-export-latex-first-lines): Fix problem with
 	publishing the region.

lisp/org.el

@@ -2322,6 +2322,9 @@ see the variable `org-use-tag-inheritance'."
 This variable applies to tags/property searches, and also to stuck
 projects because this search is based on a tags match as well.
 
+When set to the symbol `indented', sublevels are indented with
+leading dots.
+
 Because of tag inheritance (see variable `org-use-tag-inheritance'),
 the sublevels of a headline matching a tag search often also match
 the same search.  Listing all of them can create very long lists.