Fix autodoc

Author: brentru

conf.py

@@ -36,6 +36,11 @@
     'sphinx.ext.intersphinx'
 ]
 
+# Uncomment the below if you use native CircuitPython modules such as
+# digitalio, micropython and busio. List the modules you use. Without it, the
+# autodoc module docs will fail to generate with a warning.
+autodoc_mock_imports = ["adafruit_bus_device", "adafruit_register"]
+
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']