[JSDoc] Add annotations

Bulk-add JSDoc annotations, WTD-1482.

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

@@ -35,6 +35,7 @@ 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
@@ -70,4 +71,4 @@ define(
 
         return TelemetryProxy;
     }
-);
+);