Tweak action

Author: aireilly

.github/workflows/vale-on-pull.yml

@@ -1,5 +1,5 @@
----
 name: Linting with Vale on pull request
+
 on: [pull_request]
 
 jobs:
@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: errata-ai/vale-action@reviewdog
         with:
-          filter_mode: diff_context
+          filter_mode: added
           vale_flags: "--no-exit --minAlertLevel=error --glob=*.adoc"
           reporter: github-pr-review
           fail_on_error: false