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[3.13] Fix typo in Doc/extending/extending.rst (GH-136890) (#137561)

Co-authored-by: Cornelius Roemer <cornelius.roemer@gmail.com>
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Hugo van Kemenade committed
aa4525fc45c3a630f4529fb66989bb7865387f05
Parent: 0529246
Committed by GitHub <noreply@github.com> on 8/8/2025, 4:29:36 PM