Move doc comment

Author: gjtorikian

lib/html_pipeline/node_filter/absolute_source_filter.rb

@@ -4,26 +4,26 @@
 
 class HTMLPipeline
   class NodeFilter
+    # HTML Filter for replacing relative and root relative image URLs with
+    # fully qualified URLs
+    #
+    # This is useful if an image is root relative but should really be going
+    # through a cdn, or if the content for the page assumes the host is known
+    # i.e. scraped webpages and some RSS feeds.
+    #
+    # Context options:
+    #   :image_base_url - Base URL for image host for root relative src.
+    #   :image_subpage_url - For relative src.
+    #
+    # This filter does not write additional information to the context.
+    # Note: This filter would need to be run before AssetProxyFilter.
     class AbsoluteSourceFilter < NodeFilter
       SELECTOR = Selma::Selector.new(match_element: "img")
 
       def selector
         SELECTOR
       end
 
-      # HTML Filter for replacing relative and root relative image URLs with
-      # fully qualified URLs
-      #
-      # This is useful if an image is root relative but should really be going
-      # through a cdn, or if the content for the page assumes the host is known
-      # i.e. scraped webpages and some RSS feeds.
-      #
-      # Context options:
-      #   :image_base_url - Base URL for image host for root relative src.
-      #   :image_subpage_url - For relative src.
-      #
-      # This filter does not write additional information to the context.
-      # This filter would need to be run before CamoFilter.
       def handle_element(element)
         src = element["src"]
         return if src.nil? || src.empty?