small corrections

docs/source/dev/index.rst

@@ -15,7 +15,7 @@ Build the documentation
 
 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
+<https://github.com/pydata/pydata-sphinx-theme>`_ on your system and run
 
 .. code-block:: sh