Pod Resource API: Explicitly clarify the behavior of GetAllocatableResources endpoint

[swatisehgal]

The explanation that GetAllocatableResources can be used to obtain available resources
on the node can be misinterpretted as an API that is used to obtain free/unallocated
resources on a node.

This PR adds additional text to clarify that this API endpoint only returns
allocatable resources which are resources exposed to kubelet as defined here:
https://kubernetes.io/docs/tasks/administer-cluster/reserve-compute-resources/#node-allocatable.

Signed-off-by: Swati Sehgal [email protected]

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[swatisehgal]

/cc @fromanirh

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[k8s-ci-robot]

@swatisehgal: PR needs rebase.

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@swatisehgal: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

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[swatisehgal]

This change was made as part of the graduation of the feature to Beta here: #2932 so closing this PR.