rust: remove `params` from `module` macro example

Remove argument `params` from the `module` macro example, because the
macro does not currently support module parameters since it was not sent
with the initial merge.

Signed-off-by: Aswin Unnikrishnan <[e-mail]>
Reviewed-by: Alice Ryhl <[e-mail]>
Cc: [e-mail]
Fixes: 1fbde52bde73 ("rust: add `macros` crate")
Link: https://lore.kernel.org/r/[e-mail]
[ Reworded slightly. ]
Signed-off-by: Miguel Ojeda <[e-mail]>

rust/macros/lib.rs

···
 ///     author: "Rust for Linux Contributors",
 ///     description: "My very own kernel module!",
 ///     license: "GPL",
-///     params: {
-///        my_i32: i32 {
-///            default: 42,
-///            permissions: 0o000,
-///            description: "Example of i32",
-///        },
-///        writeable_i32: i32 {
-///            default: 42,
-///            permissions: 0o644,
-///            description: "Example of i32",
-///        },
-///    },
 /// }
 ///
 /// struct MyModule;