add LimitRange section, make small improvements to the VPA write-up

[iamzili]

Description

I propose small improvements to the new VPA write-up and suggest adding a section about LimitRange resources.

Issue

This issue relates to the one created in the autoscaler git repository, but it does not necessarily close it: kubernetes/autoscaler#8839

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[lmktfy]

/sig autoscaling

[aman4433]

Typo

Suggested change

	## LimitRange resouces
	## LimitRange resources