Fix comment

Author: satchel3037

notebook/notebookapp.py

@@ -1620,8 +1620,8 @@ def init_server_extensions(self):
     def init_mime_overrides(self):
         # On some Windows machines, an application has registered an incorrect
         # mimetype for CSS and JavaScript in the registry.
-        # Tornado uses this when serving .css files, causing browsers to reject the stylesheet.
-        # We know the mimetype always needs to be text/css for css
+        # Tornado uses this when serving .css and .js files, causing browsers to
+        # reject these files. We know the mimetype always needs to be text/css for css
         # and application/javascript for JS, so we override it here.
         mimetypes.add_type('text/css', '.css')
         mimetypes.add_type('application/javascript', '.js')