[Docs] clarified local volume driver docs
[Docs] clarified local volume driver docs

Signed-off-by: Nico <0e8ead3b1c56cdb71f3052e3f0ffe9c6c9087afb@gmail.com>
(cherry picked from commit 841f9859944250585b2adf2c9bf2ad5332ccc0bd)
Signed-off-by: Tibor Vass <3f1326dff4d85ad4ec938fb33f64575ace96db26@docker.com>

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