Fix formatting in xarray module to comply with kernel coding
guidelines:

- Update use clauses to use vertical layout with each import on its
  own line.
- Add trailing empty comments to preserve formatting and prevent
  rustfmt from collapsing imports.
- Break long assert_eq! statement in documentation across multiple
  lines for better readability.

Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
---
 rust/kernel/xarray.rs | 36 +++++++++++++++++++++++++++++-------
 1 file changed, 29 insertions(+), 7 deletions(-)

diff --git a/rust/kernel/xarray.rs b/rust/kernel/xarray.rs
index a49d6db288458..88625c9abf4ef 100644
--- a/rust/kernel/xarray.rs
+++ b/rust/kernel/xarray.rs
@@ -4,14 +4,33 @@
 //!
 //! C header: [`include/linux/xarray.h`](srctree/include/linux/xarray.h)
 
-use crate::{
-    alloc, bindings, build_assert,
-    error::{Error, Result},
+use core::{
+    iter,
+    marker::PhantomData,
+    pin::Pin,
+    ptr::NonNull, //
+};
+use kernel::{
+    alloc,
+    bindings,
+    build_assert, //
+    error::{
+        Error,
+        Result, //
+    },
     ffi::c_void,
-    types::{ForeignOwnable, NotThreadSafe, Opaque},
+    types::{
+        ForeignOwnable,
+        NotThreadSafe,
+        Opaque, //
+    },
+};
+use pin_init::{
+    pin_data,
+    pin_init,
+    pinned_drop,
+    PinInit, //
 };
-use core::{iter, marker::PhantomData, pin::Pin, ptr::NonNull};
-use pin_init::{pin_data, pin_init, pinned_drop, PinInit};
 
 /// An array which efficiently maps sparse integer indices to owned objects.
 ///
@@ -44,7 +63,10 @@
 /// *guard.get_mut(0).unwrap() = 0xffff;
 /// assert_eq!(guard.get(0).copied(), Some(0xffff));
 ///
-/// assert_eq!(guard.store(0, beef, GFP_KERNEL)?.as_deref().copied(), Some(0xffff));
+/// assert_eq!(
+///     guard.store(0, beef, GFP_KERNEL)?.as_deref().copied(),
+///     Some(0xffff)
+/// );
 /// assert_eq!(guard.get(0).copied(), Some(0xbeef));
 ///
 /// guard.remove(0);

-- 
2.51.2