Docs/zh_CN: Translate msg_zerocopy.rst to Simplified Chinese

Docs/zh_CN: Translate msg_zerocopy.rst to Simplified Chinese

translate the "msg_zerocopy.rst" into Simplified Chinese.

Update to commit bac2cac12c26("docs: net: description of
MSG_ZEROCOPY for AF_VSOCK")

Fix embedded code type issue by Alex Shi.

Signed-off-by: Wang Yaxin <wang.yaxin@zte.com.cn>
Signed-off-by: Jiang Kun <jiang.kun2@zte.com.cn>
Signed-off-by: xu xin <xu.xin16@zte.com.cn>
Signed-off-by: He Peilin <he.peilin@zte.com.cn>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Link: https://lore.kernel.org/r/20250319155237978a-_o_XXMLszvXPDlyRsb4@zte.com.cn
Signed-off-by: Alex Shi <alexs@kernel.org>