Remove Docker volumes background reference

[mrgiles]

Remove Docker volumes reference from Background section. Fixes #22505

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[mrgiles]

FYI @tengqm

[tengqm]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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[Shubham82]

thanks @mrgiles for the PR.
It looks good to me.
/lgtm

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: 0de9f4c67b1985718894f309f84c767bdce28041