Fix volumes document mention of readonly bind mounts

[JohnVeness]

File: storage/volumes.md

There is a sentence "The readonly option, if present, causes the bind mount to be mounted into the container as read-only", but this article is about volumes, not bind mounts.

[docker-robott]

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[JohnVeness]

/remove-lifecycle stale

[docker-robott]

There hasn't been any activity on this issue for a long time.
If the problem is still relevant, mark the issue as fresh with a /remove-lifecycle stale comment.
If not, this issue will be closed in 14 days. This helps our maintainers focus on the active issues.

Prevent issues from auto-closing with a /lifecycle frozen comment.

/lifecycle stale

[JohnVeness]

/lifecycle frozen

[JohnVeness]

/remove-lifecycle stale

[dvdksn]

Closing as fixed: the reported readonly option wording was corrected in #21420 and now refers to the volume rather than a bind mount.

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