docs($rootScope.Scope): default value of objectEquality parameter

Closes: angular#13252

Author: thorn0

src/ng/rootScope.js

@@ -379,7 +379,7 @@ function $RootScopeProvider() {
        *    - `newVal` contains the current value of the `watchExpression`
        *    - `oldVal` contains the previous value of the `watchExpression`
        *    - `scope` refers to the current scope
-       * @param {boolean=} objectEquality Compare for object equality using {@link angular.equals} instead of
+       * @param {boolean=} [objectEquality=false] Compare for object equality using {@link angular.equals} instead of
        *     comparing for reference equality.
        * @returns {function()} Returns a deregistration function for this listener.
        */