Update conf.py

Point it to the new builtin libraries used, terminalio and fontio.

Author: ch4nsuk3

docs/conf.py

@@ -27,7 +27,7 @@
 # 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 = ["displayio", "bitmaptools"]
+autodoc_mock_imports = ["displayio", "bitmaptools", "terminalio", "fontio"]
 
 
 intersphinx_mapping = {