Misc copy edits and typo fixes to Data Groups Sprint 2

[illicitonion]

What does this change?

Misc copy edits and typo fixes to Data Groups Sprint 2

Common Content?

Yes - much of JS2

Checklist

• [x] I have read the contributing guidelines
• [x] I have checked my spelling and grammar with an automated tool
• [x] I have previewed my changes to check the markdown renders as I intend
• [x] I have run my code to check it works
• [x] My changes follow our Style Guide

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