Typo

docs/source/dev/index.rst

@@ -5,8 +5,8 @@ Contributing to NIFTy
 Coding conventions
 ------------------
 
-We do not to use pure Python `assert` statements in production code. They are
-not guaranteed to by executed by Python and can be turned off by the user
+We do not use pure Python `assert` statements in production code. They are not
+guaranteed to by executed by Python and can be turned off by the user
 (`python -O` in cPython). As an alternative use `ift.myassert`.
 
 
@@ -17,4 +17,6 @@ To build the documentation from source, install `sphinx
 <https://www.sphinx-doc.org/en/stable/index.html>`_ and the `pydata sphinx theme
 <https://github.com/readthedocs/sphinx_rtd_theme>`_ on your system and run
 
-    sh docs/generate.sh
+.. code-block:: sh
+
+   sh docs/generate.sh