docs/zh_CN/rust: Update the translation of arch-support to 6.9-rc4

Update to commit 81889e8523e6 ("RISC-V: enable building
64-bit kernels with rust support")
commit 01848eee ("docs: rust: fix improper rendering in
Arch Supportpage")
commit 724a75ac ("arm64: rust: Enable Rust support
for AArch64")
commit 90868ff9 ("LoongArch: Enable initial Rust support")
commit e5e86572 ("rust: sort uml documentation arch support table")
commit 04df97e1 ("Documentation: rust: Fix arch support table")
commit 0438aadf ("rust: arch/um: Add support for CONFIG_RUST
under x86_64 UML")

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/e61eee747275c4e258416e079315b8e23fe3fde5.1714113680.git.siyanteng@loongson.cn