Update templatize.html

Author: Arthur Evans

lib/utils/templatize.html

@@ -353,7 +353,7 @@
        * - `instanceProps`: Dictionary of property names that will be added
        *   to the instance by the templatize owner.  These properties shadow any
        *   host properties, and changes within the template to these properties
-       *   will result in `notifyInstanceProp` to be called.
+       *   will result in `notifyInstanceProp` being called.
        * - `mutableData`: When `true`, the generated class will skip strict
        *   dirty-checking for objects and arrays (always consider them to be
        *   "dirty").