docs: cleanup of directive animation classes

[brettdewoody]

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[brettdewoody]

I signed it!

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CLAs look good, thanks!

[brettdewoody]

Being my first PR on this repo I'm not sure how to proceed. Do I need to fix my PR?

[Narretz]

I don't think the changes are quite correct. add, enter etc. don't mean the classes that are added, these are the actual events that are fired by the animation code.

[brettdewoody]

Do you think it would be helpful to add an examples of the classes added for each directive @Narretz?

I found the docs really lacking when I was learning about ngAnimate and ended having to use the Inspector to see what classes were being added/removed.

[Narretz]

We had a great overview over the phases until the 1.3.x docs: https://code.angularjs.org/1.3.18/docs/api/ngAnimate/service/$animate We should get those back in.some way.