Add descriptive comments

client/galaxy/scripts/mvc/library/library-foldertoolbar-view.js

@@ -210,6 +210,9 @@ var FolderToolbarView = Backbone.View.extend({
         }
     },
 
+    /**
+     * This function returns a promise
+     */
     fetchUserHistories: function() {
         this.histories = new mod_library_model.GalaxyHistories();
         return this.histories.fetch();
@@ -237,6 +240,9 @@ var FolderToolbarView = Backbone.View.extend({
         }
     },
 
+    /**
+     * This function returns a promise
+     */
     createNewHistory: function(new_history_name) {
         return $.post(`${getAppRoot()}api/histories`, { name: new_history_name });
     },

client/galaxy/scripts/mvc/workflow/workflow-terminals.js

@@ -292,6 +292,8 @@ var BaseInputTerminal = Terminal.extend({
             inputFilled = false;
         } else {
             if (this.multiple) {
+                // Can only attach one collection to multiple input
+                // data parameter.
                 inputFilled = !!this._collectionAttached();
             } else {
                 inputFilled = true;