fs: Add kernel-doc comments to proc_create_net_data_write()

This commit adds kernel-doc style comments with complete parameter
descriptions for the function proc_create_net_data_write.

Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Link: https://lore.kernel.org/r/20240315073805.77463-1-yang.lee@linux.alibaba.com


Signed-off-by: Christian Brauner <brauner@kernel.org>