[PATCH v3] drm: Add directive to format code in comment

[Javier Garcia <rampxxxx@gmail.com>]

Add formating directive line in function `drm_gpuvm_sm_map_exec_lock()`
comment to clear warning messages shown bellow that appears generating
documentation `make htmldocs`.

  Warning: ./drivers/gpu/drm/drm_gpuvm.c:2444: Unexpected indentation.
  Warning: ./drivers/gpu/drm/drm_gpuvm.c:2446: Block quote ends without a blank line; unexpected unindent.
  Warning: ./drivers/gpu/drm/drm_gpuvm.c:2450: Definition list ends without a blank line; unexpected unindent.
  Warning: ./drivers/gpu/drm/drm_gpuvm.c:2451: Definition list ends without a blank line; unexpected unindent.
  Warning: ./drivers/gpu/drm/drm_gpuvm.c:2455: Unexpected indentation.
  Warning: ./drivers/gpu/drm/drm_gpuvm.c:2456: Definition list ends without a blank line; unexpected unindent.
  Warning: ./drivers/gpu/drm/drm_gpuvm.c:2457: Definition list ends without a blank line; unexpected unindent.
  Warning: ./drivers/gpu/drm/drm_gpuvm.c:2458: Definition list ends without a blank line; unexpected unindent.

Fixes: 471920ce25d5 ("drm/gpuvm: Add locking helpers")
Signed-off-by: Javier Garcia <rampxxxx@gmail.com>
---
v2 -> v3:
      * Added the proper imperative message.
      * Fixes tag possition.
      * v2 https://lore.kernel.org/lkml/20250810112218.293272-1-rampxxxx@gmail.com

v1 -> v2:
      * Added the proper Fixes tag.
      * v1 https://lore.kernel.org/lkml/20250804212902.22554-1-rampxxxx@gmail.com
 drivers/gpu/drm/drm_gpuvm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/drm_gpuvm.c b/drivers/gpu/drm/drm_gpuvm.c
index bbc7fecb6f4a..74d949995a72 100644
--- a/drivers/gpu/drm/drm_gpuvm.c
+++ b/drivers/gpu/drm/drm_gpuvm.c
@@ -2432,6 +2432,8 @@ static const struct drm_gpuvm_ops lock_ops = {
  *
  * The expected usage is:
  *
+ * .. code-block:: c
+ *
  *    vm_bind {
  *        struct drm_exec exec;
  *
-- 
2.50.1