add terminalio to mock docs list

Author: FoamyGuy

docs/conf.py

@@ -24,7 +24,7 @@
 # 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", "supervisor", "framebufferio", "picodvi", "audiobusio"]
+autodoc_mock_imports = ["displayio", "supervisor", "framebufferio", "picodvi", "audiobusio", "terminalio"]
 
 autodoc_preserve_defaults = True