docs: Update CPython differences and improve the look of table layouts.

Updated some of the CPython feature differences:
- Updated status of some features.
- Added CSS to fix table widths to 100% and word wrap.
- Specified explicit table column ratios to improve layout appearance.
- Added missing references to anchors.
- Better consistency with use of formatting and case.

docs/conf.py

@@ -166,6 +166,10 @@ html_favicon = 'static/favicon.ico'
 # so a file named "default.css" will overwrite the builtin "default.css".
 html_static_path = ['static']
 
+# Add a custom CSS file for HTML generation
+html_css_files = [
+    'custom.css',
+]
 # Add any extra paths that contain custom files (such as robots.txt or
 # .htaccess) here, relative to this directory. These files are copied
 # directly to the root of the documentation.