Merge pull request rails#51907 from higher-pixels/no-doc-preview-image-needed

Mark `preview_image_needed_before_processing_variants?` as private API

Author: carlosantoniodasilva

activestorage/app/models/active_storage/blob/representable.rb

@@ -98,7 +98,7 @@ def representable?
     variable? || previewable?
   end
 
-  def preview_image_needed_before_processing_variants?
+  def preview_image_needed_before_processing_variants? # :nodoc:
     previewable? && !preview_image.attached?
   end