Bug 274509 - Document "Create chart datasets for this product". r=mcote, a=glob.

docs/en/rst/administering/categorization.rst

@@ -68,7 +68,10 @@ Version
     Specify the default version for this product.
 
 Create chart datasets for this product
-    Select to make chart datasets available for this product.
+    Bugzilla has a :ref:`charting system <charts>` which can plot defined
+    searches over time. Selecting this checkbox will create some useful
+    searches in the charts system relating to the new product - e.g. a search
+    for each status and resolution.
 
 It is compulsory to create at least one :ref:`component <components>` in a product, and
 so you will be asked for the details of that too.