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

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

  algined||aligned

While we are here, fix the "appplication" in the touched line in
drivers/block/loop.c.  Also, fix the "may not naturally ..." to
"may not be naturally ..." in the touched line in mm/page_alloc.

Link: http://lkml.kernel.org/r/1481573103-11329-9-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/drivers/block/loop.c b/drivers/block/loop.c
index 3043771..4b52a16 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -186,7 +186,7 @@ static void __loop_update_dio(struct loop_device *lo, bool dio)
 	 *
 	 * TODO: the above condition may be loosed in the future, and
 	 * direct I/O may be switched runtime at that time because most
-	 * of requests in sane appplications should be PAGE_SIZE algined
+	 * of requests in sane applications should be PAGE_SIZE aligned
 	 */
 	if (dio) {
 		if (queue_logical_block_size(lo->lo_queue) >= sb_bsize &&