Remove mention of $QT_API in matplotlibrc example.

anntzer · anntzer · commit ac56a38309fc · 2019-05-03T12:45:00.000+02:00
This was relevant back when the `backend.qt{4,5}` rcParams still existed
(QT_API would override them), but not anymore.  (Right now it reads like
it override the `backend` rcParam, which is plain wrong.)
diff --git a/matplotlibrc.template b/matplotlibrc.template
@@ -41,11 +41,6 @@
 ## 'module://my_backend'.
 #backend      : Agg
 
-## Note that this can be overridden by the environment variable
-## QT_API used by Enthought Tool Suite (ETS); valid values are
-## "pyqt" and "pyside".  The "pyqt" setting has the side effect of
-## forcing the use of Version 2 API for QString and QVariant.
-
 ## The port to use for the web server in the WebAgg backend.
 #webagg.port : 8988
 
