fix comment typo leve -> level in powerpc

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@holoscopio.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/arch/powerpc/mm/tlb_low_64e.S b/arch/powerpc/mm/tlb_low_64e.S
index f288279..8b04c54 100644
--- a/arch/powerpc/mm/tlb_low_64e.S
+++ b/arch/powerpc/mm/tlb_low_64e.S
@@ -1,5 +1,5 @@
 /*
- *  Low leve TLB miss handlers for Book3E
+ *  Low level TLB miss handlers for Book3E
  *
  *  Copyright (C) 2008-2009
  *      Ben. Herrenschmidt (benh@kernel.crashing.org), IBM Corp.