concepts-identity: reword group claim limit

[a-mnich]

Reworded a paragraph describing the limit of the jwt group claim to make it clearer that "200 groups" actually means 200 group memberships of a user.

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[v-dirichards]

@palma21

Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
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[v-dirichards]

@palma21 - Could you review this proposed update to your article and enter #sign-off in a comment if it's ready to merge?

Thanks!