Use Metrics Server instead of Heapster in the FAQ

[rata]

Heapster is deprecated and retired now:

https://github.com/kubernetes-retired/heapster/

The Metrics Server should be used now, so let's mention that on the FAQ
to avoid confusions.

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[rata]

/assign @aleksandra-malinowska

[mwielgus]

/lgtm
/approve

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[rata]

Thank you very much! :)