Translate Doxygen code blocks to Sphinx code blocks.

This ensures they are formatted correctly and syntax highlighted (currently
always as C++ code).

Examples/test-suite/python/doxygen_basic_translate_runme.py

@@ -50,7 +50,10 @@ commentVerifier.check(doxygen_basic_translate.function4.__doc__,
 
     Warning: This may not work as expected
 
-    int main() { while(true); }
+    .. code-block:: c++
+
+
+        int main() { while(true); }
 
     }
     """