spelling fixes: arch/i386/

Spelling fixes in arch/i386/.

Signed-off-by: Simon Arlott <simon@fire.lp0.eu>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/arch/x86/mm/discontig_32.c b/arch/x86/mm/discontig_32.c
index 1389377..fe608a4 100644
--- a/arch/x86/mm/discontig_32.c
+++ b/arch/x86/mm/discontig_32.c
@@ -273,7 +273,7 @@
 	 * When mapping a NUMA machine we allocate the node_mem_map arrays
 	 * from node local memory.  They are then mapped directly into KVA
 	 * between zone normal and vmalloc space.  Calculate the size of
-	 * this space and use it to adjust the boundry between ZONE_NORMAL
+	 * this space and use it to adjust the boundary between ZONE_NORMAL
 	 * and ZONE_HIGHMEM.
 	 */
 	find_max_pfn();