docs: make the help:usage message more readable

[OmarIthawi]

Break it into multiple lines.

References

This pull request is part of the FC-0012 project which is sparked by the Translation Infrastructure update OEP-58.

Check the links above for full information about the overall project.

Internalization is being rearchitected in Open edX Python, XBlock, Micro-frontend, and other projects. There are a number of immediately visible changes:

• Remove source and language translations from the repositories, hence no .json, .po or .mo files will be committed into the repos.
• Add standardized make extract_translations in all repositories
• Push user-facing messages strings into openedx/openedx-translations.
• Integrate root repositories with openedx/openedx-atlas to pull translations on build/deploy time

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