DOC: fix function name

src/doc/high_level_api.rst

@@ -18,7 +18,7 @@ Or to speak it out directly in Python:
    r.get_property("alpha").value = 25 # setting properties (old api)
    print(r.get_property("alpha").value + 25) # getting properties (old api)
 
-   from linkahead.high_level_api import convert_to_python_entity
+   from linkahead.high_level_api import convert_to_python_object
    obj = convert_to_python_object(r) # create a high level entity
    obj.r = 25 # setting properties (new api)
    print(obj.r + 25) # getting properties (new api)