GUAC-791: Fix type expressions to comply with JSDoc 3.

guacamole-common-js/src/main/webapp/modules/StringWriter.js

@@ -41,7 +41,7 @@ Guacamole.StringWriter = function(stream) {
     /**
      * Wrapped Guacamole.ArrayBufferWriter.
      * @private
-     * @type Guacamole.ArrayBufferWriter
+     * @type {Guacamole.ArrayBufferWriter}
      */
     var array_writer = new Guacamole.ArrayBufferWriter(stream);