docs/zh_CN: Update zh_CN/admin-guide/README.rst to 6.0-rc2

* update to commit ea052e7257bd ("docs: admin-guide: for kernel bugs
  refer to other kernel documentation")

We are in 6.x now ;)

Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Yanteng Si <siyanteng@loongson.cn>
Link: https://lore.kernel.org/r/7f6e0b8961f79befa62e0070f9682ab3abde8622.1663850554.git.bobwxc@email.cn
Signed-off-by: Jonathan Corbet <corbet@lwn.net>