message: Also count `.md` files as documentation.
diff: @@ -28,7 +28,7 @@ LABELS=$LABELS$(label_match reg:benchmarking '^benchmark/')
  LABELS=$LABELS$(label_match reg:example '^examples/')
  LABELS=$LABELS$(label_match reg:build '(cm|CM)ake')
  LABELS=$LABELS$(label_match reg:ci-cd '(^\.github/|\.yml$)')
  -LABELS=$LABELS$(label_match reg:documentation '^doc/')
  +LABELS=$LABELS$(label_match reg:documentation '^doc/|\.md$')
  LABELS=$LABELS$(label_match reg:testing /test/)
  LABELS=$LABELS$(label_match reg:helper-scripts '^dev_tools/')
  LABELS=$LABELS$(label_match type:factorization /factorization/)
  