https://developer.playcanvas.com/en/user-manual/graphics/lighting/ambient-occlusion/
Right, nope, they seem to broken.
Seems they have been moved to another folder during a refactor:
Would you like to open an issue about it in the developer.playcanvas.com repo? Or even better a pull request fixing it 
If that’s too much no worries, we will step on it.
Fixed as I happen to be doing something in the documentation: https://github.com/playcanvas/developer.playcanvas.com/pull/339
Looking to do a release tomorrow
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@yaustar great timing
@Leonidas ill make sure to beat yaustar to the pull request next time 
thanks guys
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Aha, that was nice! 