Sphinx build error

[makermelissa]

I saw this during a release. Re-running tests didn't help.

Run sphinx-build -E -W -b html . _build/html
Running Sphinx v2.3.1
making output directory... done
loading intersphinx inventory from https://docs.python.org/3.4/objects.inv...
loading intersphinx inventory from https://circuitpython.readthedocs.io/projects/bus_device/en/latest/objects.inv...
loading intersphinx inventory from https://circuitpython.readthedocs.io/en/latest/objects.inv...

Warning, treated as error:
failed to reach any of the inventories with the following issues:
intersphinx inventory 'https://circuitpython.readthedocs.io/projects/bus_device/en/latest/objects.inv' not fetchable due to <class 'requests.exceptions.HTTPError'>: 404 Client Error: Not Found for url: https://circuitpython.readthedocs.io/projects/bus_device/en/latest/objects.inv
##[error]Process completed with exit code 2.

[makermelissa]

It looks like the correct url is "https://circuitpython.readthedocs.io/projects/busdevice/en/latest/objects.inv". Now to find where it needs changing...