remove displayio from mock imports

Author: FoamyGuy

docs/conf.py

@@ -26,7 +26,6 @@
 # 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 = ["digitalio", "busio"]
-autodoc_mock_imports = ["displayio"]
 
 intersphinx_mapping = {
     "python": ("https://docs.python.org/3.4", None),