Fix dead link to numpydoc
@@ -226,7 +226,7 @@ General Concepts
We try to adhere to `PEP257
<https://www.python.org/dev/peps/pep-0257/>`_, and follow `NumpyDoc
- conventions <numpydoc.readthedocs.io/en/latest/format.html>`_.
+ conventions <https://numpydoc.readthedocs.io/en/latest/format.html>`_.
double underscore
double underscore notation
