[V3 Docs] Docs for utils package (#1085)

* Docstrings for chat formatting

* Docstrings for mod utils

* Type checking

* Override CSS to highlight object name in definition

* More typing

* Utils docs pages

* Fix typo here

docs/conf.py

@@ -103,6 +103,9 @@ html_theme = 'sphinx_rtd_theme'
 # html_theme_options = {}
 
 html_context = {
+    'css_files': [
+        '_static/theme_overrides.css'
+    ],
     # Enable the "Edit in GitHub link within the header of each page.
     'display_github': True,
     'github_user': 'Cog-Creators',