Enable checked_norem_div in doctests

Author: newpavlov

library/core/src/num/int_macros.rs

@@ -676,6 +676,7 @@ macro_rules! int_impl {
         /// Basic usage:
         ///
         /// ```
+        /// #![feature(checked_norem_div)]
         #[doc = concat!("assert_eq!((", stringify!($SelfT), "::MIN + 1).checked_norem_div(-1), Some(", stringify!($Max), "));")]
         #[doc = concat!("assert_eq!((-5", stringify!($SelfT), ").checked_norem_div(2), None);")]
         #[doc = concat!("assert_eq!(", stringify!($SelfT), "::MIN.checked_norem_div(-1), None);")]

library/core/src/num/uint_macros.rs

@@ -662,6 +662,7 @@ macro_rules! uint_impl {
         /// Basic usage:
         ///
         /// ```
+        /// #![feature(checked_norem_div)]
         #[doc = concat!("assert_eq!(128", stringify!($SelfT), ".checked_norem_div(2), Some(64));")]
         #[doc = concat!("assert_eq!(129", stringify!($SelfT), ".checked_norem_div(2), None);")]
         #[doc = concat!("assert_eq!(1", stringify!($SelfT), ".checked_norem_div(0), None);")]