Update documentation of as_ptr to reflect that its usage must not lead to data races.

Author: madhav-madhusoodanan

library/core/src/sync/atomic.rs

@@ -3406,7 +3406,7 @@ macro_rules! atomic_int {
             /// atomic types work with interior mutability. All modifications of an atomic change the value
             /// through a shared reference, and can do so safely as long as they use atomic operations. Any
             /// use of the returned raw pointer requires an `unsafe` block and still has to uphold the same
-            /// restriction: operations on it must be atomic.
+            /// restriction: operations on it must not lead to data races.
             ///
             /// # Examples
             ///
@@ -3420,7 +3420,7 @@ macro_rules! atomic_int {
             ///
             #[doc = concat!("let atomic = ", stringify!($atomic_type), "::new(1);")]
             ///
-            /// // SAFETY: Safe as long as `my_atomic_op` is atomic.
+            /// // SAFETY: Safe as long as `my_atomic_op` does not lead to a data race.
             /// unsafe {
             ///     my_atomic_op(atomic.as_ptr());
             /// }