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[3.13] Docs: fix docstring of `email.message.Message.add_header` (GH-134355) (#135340)

Docs: fix docstring of `email.message.Message.add_header` (GH-134355)
(cherry picked from commit c23eec29602eb090d6f3e854e41c22c1e2c6dfc2)

Co-authored-by: Alexander Shadchin <shadchin@yandex-team.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>
M
Miss Islington (bot) committed
a09199e3ccdf4a0e8c4499d28f27c85d8ea754ac
Parent: 67c7439
Committed by GitHub <noreply@github.com> on 7/3/2025, 10:22:39 AM