Switch comments to plain markdown

config/user.role.anonymous.yml

@@ -3,6 +3,7 @@ langcode: en
 status: true
 dependencies:
   config:
+    - filter.format.markdown
     - filter.format.minimalhtml
     - filter.format.restricted_html
   module:
@@ -28,6 +29,7 @@ permissions:
   - 'post comments'
   - 'subscribe to comments'
   - 'use exclude node title'
+  - 'use text format markdown'
   - 'use text format minimalhtml'
   - 'use text format restricted_html'
   - 'view media'