[JSDoc] Add annotations

Bulk-add JSDoc annotations, WTD-1482.

platform/features/layout/src/elements/ImageProxy.js

@@ -32,6 +32,7 @@ define(
          * Note that arguments here are meant to match those expected
          * by `Array.prototype.map`
          *
+         * @memberof platform/features/layout
          * @constructor
          * @param element the fixed position element, as stored in its
          *        configuration
@@ -45,6 +46,7 @@ define(
              * Get and/or set the displayed text of this element.
              * @param {string} [text] the new text (if setting)
              * @returns {string} the text
+             * @memberof platform/features/layout.ImageProxy#
              */
             proxy.url = new AccessorMutator(element, 'url');
 
@@ -53,4 +55,4 @@ define(
 
         return ImageProxy;
     }
-);
+);