fix: clarified help menu

[alanssitis]

What is a quick description of the change?

Minor change to docker shell file help.

Is this fixing an issue?

Were any issues created as a result of this change?

Are there more details that are relevant?

Check lists (check x in [ ] of list items)

For each of these items, please refer to the software style guide

• [ ] Test written/updated
• [ ] Tests passing
• [ ] Logging (where appropriate)
• [ ] Coding style

Any additional comments?