Rollup merge of #150035 - agavra:patch-1, r=Mark-Simulacrum

fix docustring on fetch_or

The documentation had the same example twice in a row, but I think this was the intended second example.

library/core/src/sync/atomic.rs

@@ -1151,8 +1151,8 @@ impl AtomicBool {
     /// assert_eq!(foo.fetch_or(false, Ordering::SeqCst), true);
     /// assert_eq!(foo.load(Ordering::SeqCst), true);
     ///
-    /// let foo = AtomicBool::new(true);
-    /// assert_eq!(foo.fetch_or(true, Ordering::SeqCst), true);
+    /// let foo = AtomicBool::new(false);
+    /// assert_eq!(foo.fetch_or(true, Ordering::SeqCst), false);
     /// assert_eq!(foo.load(Ordering::SeqCst), true);
     ///
     /// let foo = AtomicBool::new(false);