docs(content.proto): update comment to reflect correct message name f…

…rom AnnotationAttributes to ContentAttributes

Clarifying the comment ensures that developers understand which message is being referenced for filtering. This change improves documentation accuracy and helps prevent confusion when using the ListParameters message.

dictybase/content/content.proto

@@ -133,7 +133,7 @@ message ListParameters {
   // by a filter expression. It uses the following syntax...
   //        field_name operator expression
   //
-  // The following fields of `AnnotationAttributes` definition are allowed to
+  // The following fields of `ContentAttributes` definition are allowed to
   // be used for filtering
   //   * name        - page name (string).
   //   * slug        - page slug (string).