Update troubleshooting README to remove old Insider info - #6495

Skipping `.github/workflows/issue-closure-recommendation.lock.yml` because it could not be parsed file within time limit (slow-file)

Skipping `.github/workflows/duplicate-surfacing.lock.yml` because it could not be parsed file within time limit (slow-file)

Line matches candidate pattern (assign regex) `= /[^*].*?(?:[a-z]{3,}|[A-Z]{3,}|[A-Z][a-z]{2,}).*/[gi]?(?=\W|$)` (candidate-pattern)