docs(ngAnimate.$animate): fix classes during the various animation phases

I am not 100% sure for the class additions (although I am 99+% sure).
(If someone could double-check (@matsko ideally ?), that would be great :smiley:)
Are you referring to the space after `off"`?
This is for properly aligning the `|` on the right edge of the table (probably not necessary, but look good).