Repair kernel-doc comments to avoid kernel-doc warnings:

Warning: include/drm/drm_exec.h:146 No description found for return value of 'drm_exec_is_contended'
WARNING: include/drm/drm_exec.h:157 function parameter '_exec' not described in 'drm_exec_retry'
WARNING: include/drm/drm_exec.h:157 Excess function parameter 'exec' description in 'drm_exec_retry'

Fixes: bba175a2d4be ("drm/exec, drm/xe: Avoid abusing the drm_exec retry pointer")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
---
v2: rebase & resend
v3: rebase & resend

Cc: David Airlie <airlied@gmail.com>
Cc: Simona Vetter <simona@ffwll.ch>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: dri-devel@lists.freedesktop.org

 include/drm/drm_exec.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- linux-next-20260828.orig/include/drm/drm_exec.h
+++ linux-next-20260828/include/drm/drm_exec.h
@@ -140,7 +140,7 @@ drm_exec_retry: __maybe_unused;						\
  * drm_exec_is_contended - check for contention
  * @exec: drm_exec object
  *
- * Returns true if the drm_exec object has run into some contention while
+ * Returns: true if the drm_exec object has run into some contention while
  * locking a GEM object and needs to clean up.
  */
 static inline bool drm_exec_is_contended(struct drm_exec *exec)
@@ -150,7 +150,7 @@ static inline bool drm_exec_is_contended
 
 /**
  * drm_exec_retry() - Unconditionally restart the loop to grab all locks.
- * @exec: drm_exec object
+ * @_exec: drm_exec object
  *
  * Unconditionally retry the loop to lock all objects. For consistency,
  * the exec object needs to be newly initialized.