Add missing parameter documentation

service.js

@@ -36,6 +36,7 @@ class BesService {
    * Registers grammar checking service
    *
    * @param {Element} hostElement DOM element to register grammar checking service for
+   * @param {BesTAService} textAreaService <textarea> support service
    * @returns {BesService} Grammar checking service instance
    */
   static register(hostElement, textAreaService) {
@@ -70,6 +71,7 @@ class BesService {
    * Recursively grammar-proofs a DOM tree.
    *
    * @param {Node} node DOM root node to proof
+   * @param {Boolean} isInitialCall Is this first-level call in recursion?
    * @returns {Array} Markup of text to proof using BesStr
    */
   async proof(node, isInitialCall = true) {