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gh-99735: Use required=True in argparse subparsers example (GH-100927)

(cherry picked from commit 6aab56f3c2ee331116eba242d2fcdca592577328)

Co-authored-by: Patricio Paez <nospam@pp.com.mx>
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Miss Islington (bot) committed
4969903f7ea9393303dab0d48886b4d10095a063
Parent: 62db23c
Committed by GitHub <noreply@github.com> on 2/19/2023, 7:11:40 PM