Minor `read-only` clarification (#13521)

* Minor `read-only` clarification

## Why

It was not obvious to me that `ro` is the shorthand form of `readonly`.

## Description

This adds a bit of text to explicitly state that `ro` is the shorthand form of `readonly` when using volumes

* Update storage/volumes.md

Co-authored-by: Sebastiaan van Stijn <thaJeztah@users.noreply.github.com>

Co-authored-by: Usha Mandya <47779042+usha-mandya@users.noreply.github.com>
Co-authored-by: Sebastiaan van Stijn <thaJeztah@users.noreply.github.com>
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Typing Turtle 2021-10-04 05:50:21 -04:00 committed by GitHub
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@ -72,7 +72,7 @@ If you need to specify volume driver options, you must use `--mount`.
is mounted in the container. May be specified as `destination`, `dst`,
or `target`.
- The `readonly` option, if present, causes the bind mount to be [mounted into
the container as read-only](#use-a-read-only-volume).
the container as read-only](#use-a-read-only-volume). May be specified as `readonly` or `ro`.
- The `volume-opt` option, which can be specified more than once, takes a
key-value pair consisting of the option name and its value.