drm/virtio: Spelling fixes

While making a spelling mistake myself for `git grep kvalloc`
I found that the only file has such a typo. Fix it and update
to the standard de facto of how we refer to the functions.
Also spell usr-out as user-out, it seems this driver uses its
own terminology nobody else can decypher, make it more readable.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231219151955.2477488-1-andriy.shevchenko@linux.intel.com

drivers/gpu/drm/virtio/virtgpu_submit.c

@@ -99,8 +99,8 @@ virtio_gpu_parse_deps(struct virtio_gpu_submit *submit)
 		return 0;
 
 	/*
-	 * kvalloc at first tries to allocate memory using kmalloc and
-	 * falls back to vmalloc only on failure. It also uses __GFP_NOWARN
+	 * kvmalloc() at first tries to allocate memory using kmalloc() and
+	 * falls back to vmalloc() only on failure. It also uses __GFP_NOWARN
 	 * internally for allocations larger than a page size, preventing
 	 * storm of KMSG warnings.
 	 */
@@ -529,7 +529,7 @@ int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
 	virtio_gpu_submit(&submit);
 
 	/*
-	 * Set up usr-out data after submitting the job to optimize
+	 * Set up user-out data after submitting the job to optimize
 	 * the job submission path.
 	 */
 	virtio_gpu_install_out_fence_fd(&submit);