docs: Remove make headers_check from checklist in translations

Commit 1a63f9cc ("docs: Remove make headers_check from checklist")
fixed only the English version.

Let's fix the translated variants too.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Link: https://lore.kernel.org/r/20210302141822.504773-1-masahiroy@kernel.org


Signed-off-by: Jonathan Corbet <corbet@lwn.net>