docs/zh_CN/rust: Update the translation of quick-start to 6.9-rc4

Update to commit 711cbfc7 ("docs: rust: Clarify that 'rustup
override' applies to build directory")
commit 7583ce66 ("docs: rust: remove `CC=clang` mentions")
commit 2285eb2f ("docs: rust: clarify what 'rustup override' does")
commit 8cb40124 ("docs: rust: update instructions for obtaining
'core' source")
commit b603c6cc ("docs: rust: add command line to rust-analyzer
section")
commit 08ab7865 ("rust: bindgen: upgrade to 0.65.1")
commit eae90172 ("docs: rust: add paragraph about finding a
suitable `libclang`")
commit 6883b29c ("docs: rust: point directly to the standalone
installers")

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/aff560c262f255e873c07cc66891cf8140ad433d.1714113680.git.siyanteng@loongson.cn