docs(mocks): update src/ngMock/angular-mocks.js documentation

Clarify how to use `$exceptionHandlerProvider.mode('log')` in tests

Author: fredsa

src/ngMock/angular-mocks.js

@@ -1,4 +1,3 @@
-
 /**
  * @license AngularJS v"NG_VERSION_FULL"
  * (c) 2010-2012 Google, Inc. http://angularjs.org
@@ -221,8 +220,8 @@ angular.mock.$ExceptionHandlerProvider = function() {
    *   - `rethrow`: If any errors are are passed into the handler in tests, it typically
    *                means that there is a bug in the application or test, so this mock will
    *                make these tests fail.
-   *   - `log`: Sometimes it is desirable to test that an error is throw, for this case the `log` mode stores the
-   *            error and allows later assertion of it.
+   *   - `log`: Sometimes it is desirable to test that an error is throw, for this case the `log` mode stores an
+   *            array of errors in `$exceptionHandler.errors`, to allow later assertion of them.
    *            See {@link ngMock.$log#assertEmpty assertEmpty()} and
    *             {@link ngMock.$log#reset reset()}
    */