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

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[SleeplessByte]

Suggested change

	In the next tasks, the ==ratePerHour== variable and the ==dayRate== function are related to money. The units of measurement are money for a unit of time (hours and days respectively).
	The `ratePerHour` variable and the `dayRate` function are related to money.
	The units of measurement are money for a unit of time: hours and days respectively.

Perhaps like this?

• ==xxx== means nothing in Markdown, but xxx will format it as monospace (code)
• Each sentence should be on a new line, even though that's not followed everywhere in this file. We did not have a styleguide when this exercise was written!
• If you accept this proposal, you can press the Commit suggestion button and it will do it for you.

[Cool-Katt]

@Erz3 Did you have time to look into this proposal? Seems okay to me.

[Erz3]

Ok, It's look fine.

@SleeplessByte Where could I find "Commit suggestion" button? I just saw "close pull request" at the bottom.