docs(ngAnimate): update staggering config for use with css animations

Closes #15743

Author: pablotarga

src/ngAnimate/module.js

@@ -177,6 +177,10 @@
  *   /* As of 1.4.4, this must always be set: it signals ngAnimate
  *     to not accidentally inherit a delay property from another CSS class */
  *   transition-duration: 0s;
+ *
+ *   /* if you are using animations instead of transitions you should configure as follows:
+ *     animation-delay: 0.1s;
+ *     animation-duration: 0s; */
  * }
  * .my-animation.ng-enter.ng-enter-active {
  *   /* standard transition styles */