moduleparam: fix parameter description mismatch

The first parameter of module_param is @name, but @value is used
in description. Fix it.

Fixes: 546970bc ("param: add kerneldoc to moduleparam.h")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>