drm/radeon: fix typo in cik_ring_ib_execute documentation (v2)

v2: agd: clarify commit message, fix "an" as spotted by Michel.
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/cik.c

@@ -4132,10 +4132,10 @@ struct radeon_fence *cik_copy_cpdma(struct radeon_device *rdev,
  * @rdev: radeon_device pointer
  * @ib: radeon indirect buffer object
  *
- * Emits an DE (drawing engine) or CE (constant engine) IB
+ * Emits a DE (drawing engine) or CE (constant engine) IB
  * on the gfx ring.  IBs are usually generated by userspace
  * acceleration drivers and submitted to the kernel for
- * sheduling on the ring.  This function schedules the IB
+ * scheduling on the ring.  This function schedules the IB
  * on the gfx ring for execution by the GPU.
  */
 void cik_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib)