docs: updates to stat panel documentation (#84814)
* docs: updates to stat panel documentation
* Apply suggestions from code review
Co-authored-by: Isabel Matwawana <76437239+imatwawana@users.noreply.github.com>
* Made formatting and wording edit
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Co-authored-by: Isabel Matwawana <76437239+imatwawana@users.noreply.github.com>
Co-authored-by: Isabel Matwawana <isabel.matwawana@grafana.com>
(cherry picked from commit 34195ba854)
Co-authored-by: Marie Cruz <mdcruz@users.noreply.github.com>