Add ABE for <amp-fx="fly-in"> (#1292)
Add ABE for <amp-fx="fly-in"> (#1292)

* Format previous examples. Add new examples.

* Clarify platform dependent presets

* Add examples on combining presets as well

ampproject/amp-by-example,ampproject/amp-by-example,ampproject/amp-by-example,ampproject/amp-by-example