Optional noqa removes

Signed-off-by: Fabian Haase <haase.fabian@gmail.com>

Author: FHaase

doc/source/contributing.rst

@@ -744,15 +744,15 @@ Transitioning to ``pytest``
 .. code-block:: python
 
     class TestReallyCoolFeature(object):
-        ....                                  # noqa: E999
+        pass
 
 Going forward, we are moving to a more *functional* style using the `pytest <http://docs.pytest.org/en/latest/>`__ framework, which offers a richer testing
 framework that will facilitate testing and developing. Thus, instead of writing test classes, we will write test functions like this:
 
 .. code-block:: python
 
     def test_really_cool_feature():
-        ....                                  # noqa: E999
+        pass
 
 Using ``pytest``
 ~~~~~~~~~~~~~~~~

doc/source/contributing_docstring.rst

@@ -197,26 +197,29 @@ infinitive verb.
         """
         pass
 
+.. code-block:: python
 
-    def astype(dtype):    # noqa: F811
+    def astype(dtype):
         """
         Method to cast Series type.
 
         Does not start with verb.
         """
         pass
 
+.. code-block:: python
 
-    def astype(dtype):    # noqa: F811
+    def astype(dtype):
         """
         Cast Series type
 
         Missing dot at the end.
         """
         pass
 
+.. code-block:: python
 
-    def astype(dtype):    # noqa: F811
+    def astype(dtype):
         """
         Cast Series type from its current type to the new type defined in
         the parameter dtype.