DOC: Remove sphinxext errors

The doc for the sphinx extension says the sentence "list directives
here" but the directives are now listed in full above.

In addition, the word "with" was repeated twice in a row but probably
went unnoticed since it happens at a line break.

docs/source/sphinxext.rst

@@ -163,9 +163,8 b' Testing directive outputs'
 =========================
 
 The IPython Sphinx Directive makes it possible to test the outputs that you provide with your code. To do this,
-decorate the contents in your directive block with one of the following:
-
-  * list directives here
+decorate the contents in your directive block with one of the options listed
+above.
 
 If an IPython doctest decorator is found, it will take these steps when your documentation is built:
 
@@ -435,7 +434,7 b' And persist across sessions'
    print(square(-2))
 
 Pretty much anything you can do with the ipython code, you can do with
-with a simple python script. Obviously, though it doesn't make sense
+a simple python script. Obviously, though it doesn't make sense
 to use the doctest option.
 
 .. _pseudo-decorators: