docs(CHANGELOG.md): add release notes for 1.6.10

Author: Narretz

CHANGELOG.md

@@ -437,7 +437,8 @@
   ([bb464d](https://github.com/angular/angular.js/commit/bb464d16b434b9e2de2fecf80c192d4741cba879),
   [#15567](https://github.com/angular/angular.js/issues/15567),
   [#15571](https://github.com/angular/angular.js/issues/15571))
-- **ngMockE2E:** ensure that mocked `$httpBackend` uses correct `$browser`
+- **ngMockE2E:** ensure that mocked `$
+httpBackend` uses correct `$browser`
   ([bd63b2](https://github.com/angular/angular.js/commit/bd63b2235cd410251cb83eebd9a47d3102830b6b),
   [#15593](https://github.com/angular/angular.js/issues/15593))