closes #28 Updated all WHO metadata

[Pierre-Wallet]

28 Updated documentation with metadata tag

28 added tests for Head circumference metadata

28 Capitalised bmi in the documentation

Thank you for your Pull Request! We have developed this task checklist from the Development Process Guide to help with the final steps of the process. Completing the below tasks helps to ensure our reviewers can maximize their time on your code as well as making sure the admiral codebase remains robust and consistent.

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• [x] Place Closes # into the beginning of your Pull Request Title (Use Edit button in top-right if you need to update)
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[Pierre-Wallet]

@rossfarrugia , all updates done! It was eventually not a minor update :)

[Pierre-Wallet]

@rossfarrugia , could you please explain me what this "Check Expected — Waiting for status to be reported" means and what action is expected from my side? Thanks!

[rossfarrugia]

@rossfarrugia , could you please explain me what this "Check Expected — Waiting for status to be reported" means and what action is expected from my side? Thanks!

Ignore this one Pierre - I spotted same in some of mine. @zdz2101 can we get this one removed please from the CI checks?

Will try and review this PR tomorrow.

[zdz2101]

@rossfarrugia @Pierre-Wallet Yea I'll look into it but I think it might be related to the Check / (release/devel/oldrel) and supposed to go away once those resolve, but I'll check again