update doc

Co-authored-by: Miguel Ojeda <[email protected]>

rust/kernel/module_param.rs

@@ -2,7 +2,7 @@ use core::fmt::Write;
 
 /// Types that can be used for module parameters.
 /// Note that displaying the type in `sysfs` will fail if `to_string` returns
-/// more than 4K bytes (including an additional null terminator).
+/// more than 4 KiB (including an additional null terminator).
 pub trait ModuleParam : core::fmt::Display + core::marker::Sized {
     fn try_from_param_arg(arg: &[u8]) -> Option<Self>;