docs/zh_CN/rust: Update the translation of general-information to 6.9-rc4

Update to commit ba4abeb1 ("docs: rust: Move testing to a
separate page")
commit be412baf ("docs: rust: Add rusttest info")
commit bd9e54a4 ("docs: rust: update Rust docs output path")

Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/09fc6c2e0553fb5fae9c91146e1bceb149b6cf71.1714113680.git.siyanteng@loongson.cn