drm: drm_gem.h: delete duplicated words in comments

Drop the doubled words "the" and "by" in comments.

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: David Airlie <[e-mail]>
Cc: Daniel Vetter <[e-mail]>
Cc: [e-mail]
Signed-off-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

include/drm/drm_gem.h

···
 	/**
 	 * @vunmap:
 	 *
-	 * Releases the the address previously returned by @vmap. Used by the
+	 * Releases the address previously returned by @vmap. Used by the
 	 * drm_gem_dmabuf_vunmap() helper.
 	 *
 	 * This callback is optional.
···
 	 *
 	 * This callback is optional.
 	 *
-	 * The callback is used by by both drm_gem_mmap_obj() and
+	 * The callback is used by both drm_gem_mmap_obj() and
 	 * drm_gem_prime_mmap().  When @mmap is present @vm_ops is not
 	 * used, the @mmap callback must set vma->vm_ops instead.
 	 */