Update instructions.md with a note

[Erz3]

Added note to clarify "ratePerHour" and "dayRate" meaning.

https://forum.exercism.org/t/javascript-freelancer-rates-confused-spelling/16054

[github-actions]

Hello. Thanks for opening a PR on Exercism 🙂

We ask that all changes to Exercism are discussed on our Community Forum before being opened on GitHub. To enforce this, we automatically close all PRs that are submitted. That doesn't mean your PR is rejected but that we want the initial discussion about it to happen on our forum where a wide range of key contributors across the Exercism ecosystem can weigh in.

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[Cool-Katt]

/format

[github-actions]

The "Format code" action has started running.

[github-actions]

The "Format code" action has finished running.

[github-actions]

For security reasons, /format does not trigger CI builds when the PR has been submitted from a fork. If checks were not passing due to code format, trigger a build to make the required checks pass, through one of the following ways:

• Push an empty commit to this branch: git commit --allow-empty -m "Trigger builds".
• Close and reopen the PR.
• Push a regular commit to this branch.