scripts/spelling.txt: add "embeded" pattern and fix typo instances

Fix typos and add the following to the scripts/spelling.txt:

  embeded||embedded

Link: http://lkml.kernel.org/r/1481573103-11329-12-git-send-email-yamada.masahiro@socionext.com
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 82fd0cc..8fab716 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -185,7 +185,7 @@ static struct throtl_grp *sq_to_tg(struct throtl_service_queue *sq)
  * sq_to_td - return throtl_data the specified service queue belongs to
  * @sq: the throtl_service_queue of interest
  *
- * A service_queue can be embeded in either a throtl_grp or throtl_data.
+ * A service_queue can be embedded in either a throtl_grp or throtl_data.
  * Determine the associated throtl_data accordingly and return it.
  */
 static struct throtl_data *sq_to_td(struct throtl_service_queue *sq)