Remove mention of animation frame callback

[patrickhlauke]

Discussed in today's PEWG meeting. Remove explicit mention of animation frame callback, as user agents may have other reasons to delay dispatch of pointermove.

Closes #385

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[patrickhlauke]

note that instead of just ripping out the sentence/reference to animation frame callback, I replaced it with a more generic sentence. otherwise, the fact that pointermove may be delayed (later in the pointerrawupdate definition) would come a bit out of left-field and surprise the reader...

[plehegar]

You left one instance of animation frame callback, at

pointerevents/index.html

Line 557 in 6ca26a4

due to the fact that <code>pointermove</code> events might get aligned with animation frame callbacks and get coalesced, and the final position of the event

How about:
... due to the fact that pointermove events might get delayed or coalesced, ...

[patrickhlauke]

You left one instance of animation frame callback

zut alors...well spotted. Changed per suggestion.