Update dev-docs

docs/source/developer/contributing.rst

@@ -92,6 +92,11 @@ When working with a source checkout of Numba you will also need a development
 build of llvmlite. These are available from the ``numba/label/dev`` channel on
 `anaconda.org <https://anaconda.org/numba/llvmlite>`_.
 
+First add the Anaconda Cloud ``numba`` and ``numba/label/dev``
+channels so as to get development builds of the llvmlite library::
+
+   $ conda config --add channels numba
+   $ conda config --add channels numba/label/dev
 
 Then, to create an environment with a few of the most common dependencies::
 
@@ -465,12 +470,12 @@ It is built with `Sphinx <http://sphinx-doc.org/>`_ and
 `numpydoc <https://numpydoc.readthedocs.io/>`_, which are available using
 conda or pip; i.e. ``conda install sphinx numpydoc``.
 
-To build the documentation, you need the bootstrap theme::
+To build the documentation, you need the rtd theme::
 
-   $ pip install sphinx_bootstrap_theme
+   $ conda install sphinx_rtd_theme
 
 You can edit the source files under ``docs/source/``, after which you can
-build and check the documentation::
+build and check the documentation under ``docs/``::
 
    $ make html
    $ open _build/html/index.html