Add a note about filesystem overhead for PVC size request

[akalenyu]

Description

Though this is not explicitly stated, it seems acceptable that
once a provider builds a filesystem on top of a block device,
some writeable capacity is lost:
container-storage-interface/spec#338

Issue

Closes: #

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[akalenyu]

/cc @jsafrane @nixpanic

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[Ritikaa96]

for triage and reviews:
/sig storage

[nixpanic]

Thanks!

/lgtm
/assign saad-ali

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 2baf53bb97e7c9b049ee4ceb206cf38850fa0409

[Arhell]

lgtm

[tengqm]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tengqm

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[jsafrane]

/lgtm
from storage POV

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: c36a1b695e8eed98595d416664390b75cf36e50b