doc: refine inline volume example

[andyzhangx]

What type of PR is this?
/kind documentation

What this PR does / why we need it:
doc: refine inline volume example

Which issue(s) this PR fixes:

Fixes #1022

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

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[calohmn]

to avoid performance issue, use persistent volume instead of inline volume when numerous pods are accessing the same volume.

@andyzhangx This is a bit confusing to me. Since the inline volume is directly associated with the pod, there is only one pod accessing one inline volume, if I'm not mistaken. Or did you mean "accessing the same storage account/container"?

[andyzhangx]

@calohmn if you have 10 pods on one node using inline volume accessing the same storage account & container, there would be 10 standalone blobfuse mount on one node, while if you use one pv (representing one storage account & container), there would be only one blobfuse mount on the node.