missing jsdoc

Co-authored-by: Jakub Rożek <jakub@rozek.tech>

Author: paztis

lib/dereference.js

@@ -100,6 +100,7 @@ function crawl (obj, path, pathFromRoot, parents, processedObjects, dereferenced
  * @param {string} pathFromRoot - The path of `$ref` from the schema root
  * @param {object[]} parents - An array of the parent objects that have already been dereferenced
  * @param {object[]} processedObjects - An array of all the objects that have already been dereferenced
+ * @param {object} dereferencedCache - An map of all the dereferenced objects 
  * @param {$Refs} $refs
  * @param {$RefParserOptions} options
  * @returns {{value: object, circular: boolean}}