docs(exceptionHandler): document testing

Update src/ng/exceptionHandler.js

Here's an iniitla attempt at documenting how one might write a
test using $exceptionHandlerProvider. The key take-away is the use
of this pattern:

it(...

 module(...
   $exceptionHandlerProvider.mode('log');
 });

 inject(...
 );

});

1 files changed, 2 insertions, 1 deletions

diff --git a/src/ng/exceptionHandler.js b/src/ng/exceptionHandler.js
index 4378e102..f74e09ee 100644
--- a/src/ng/exceptionHandler.js
+++ b/src/ng/exceptionHandler.js
@@ -11,11 +11,12 @@
  * the browser console.
  *
  * In unit tests, if `angular-mocks.js` is loaded, this service is overridden by
- * {@link ngMock.$exceptionHandler mock $exceptionHandler}
+ * {@link ngMock.$exceptionHandler mock $exceptionHandler} which aids in testing.
  *
  * @param {Error} exception Exception associated with the error.
  * @param {string=} cause optional information about the context in which
  *       the error was thrown.
+ *
  */
 function $ExceptionHandlerProvider() {
   this.$get = ['$log', function($log){