rust: sync: atomic: Update documentation for `fetch_add()`

The documentation for `fetch_add()` does not indicate that the original
value is returned by `fetch_add()`. Update the documentation so this is
clear.

Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
Signed-off-by: Boqun Feng <boqun@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://patch.msgid.link/20260220-atomic-sub-v3-2-e63cbed1d2aa@kernel.org
Link: https://patch.msgid.link/20260303201701.12204-13-boqun@kernel.org

1 files changed, 4 insertions, 6 deletions

diff --git a/rust/kernel/sync/atomic.rs b/rust/kernel/sync/atomic.rs
index 545a8d37ba78..9cd009d57e35 100644
--- a/rust/kernel/sync/atomic.rs
+++ b/rust/kernel/sync/atomic.rs
@@ -545,16 +545,14 @@ where
     /// use kernel::sync::atomic::{Atomic, Acquire, Full, Relaxed};
     ///
     /// let x = Atomic::new(42);
-    ///
     /// assert_eq!(42, x.load(Relaxed));
-    ///
-    /// assert_eq!(54, { x.fetch_add(12, Acquire); x.load(Relaxed) });
+    /// assert_eq!(42, x.fetch_add(12, Acquire));
+    /// assert_eq!(54, x.load(Relaxed));
     ///
     /// let x = Atomic::new(42);
-    ///
     /// assert_eq!(42, x.load(Relaxed));
-    ///
-    /// assert_eq!(54, { x.fetch_add(12, Full); x.load(Relaxed) } );
+    /// assert_eq!(42, x.fetch_add(12, Full));
+    /// assert_eq!(54, x.load(Relaxed));
     /// ```
     #[inline(always)]
     pub fn fetch_add<Rhs, Ordering: ordering::Ordering>(&self, v: Rhs, _: Ordering) -> T