Only CPython code should appear in Operators section of the doc (#206)

Author: cbellot000

docs/source/operator_reference.rst

@@ -9,7 +9,7 @@ Loading operators...
 .. raw:: html
 
     <iframe
-      src="_static/dpf.html"
+      src="_static/dpf.html#CPython"
       style="
         position: fixed;
         top: 36px;