Revise sentence for clarity about settings

What does this MR do?

@rdickenson noted in !66777 (diffs, comment 634921480) that this sentence in doc/user/group/index.md didn't really make sense. Let's try to fix that.

The catch: I'm not certain what it was TRYING to say. I'll route this over to @phikai - he will either know the answer, or know who I can ask.

Related issues

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