Specify Option<NonZero> layout and bit validity

Author: joshlf

library/core/src/num/nonzero.rs

@@ -39,8 +39,7 @@ macro_rules! nonzero_integers {
             ///
             #[doc = concat!("`", stringify!($Ty), "` is guaranteed to have the same layout and bit validity as `", stringify!($Int), "`")]
             /// with the exception that `0` is not a valid instance.
-            #[doc = concat!("`Option<", stringify!($Ty), ">` is guaranteed to be compatible with `", stringify!($Int), "`,")]
-            /// including in FFI.
+            #[doc = concat!("`Option<", stringify!($Ty), ">` is guaranteed to have the same layout and bit validity as `", stringify!($Int), "`.")]
             #[$stability]
             #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
             #[repr(transparent)]