Fix line width

Author: astrojuanlu

doc/tutorial/describing-code.rst

@@ -11,8 +11,8 @@ Documenting Python objects
 --------------------------
 
 Sphinx offers several roles and directives to document Python objects,
-all grouped together in :ref:`the Python domain <python-domain>`. For example, you can
-use the :rst:dir:`py:function` directive to document a Python function,
+all grouped together in :ref:`the Python domain <python-domain>`. For example,
+you can use the :rst:dir:`py:function` directive to document a Python function,
 as follows:
 
 .. code-block:: rst