Add vale_flags to Vale action for error level configuration

Author: hawkeyexl

.github/workflows/vale.yml

@@ -21,5 +21,6 @@ jobs:
         with:
           files: "docs/"
           fail_on_error: false
+          vale_flags: "--minAlertLevel=error"
         env:
           GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}