spelling: s/appropiate/appropriate/

Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt
index 7eb715e..4ae4188 100644
--- a/Documentation/cachetlb.txt
+++ b/Documentation/cachetlb.txt
@@ -136,7 +136,7 @@
 8) void lazy_mmu_prot_update(pte_t pte)
 	This interface is called whenever the protection on
 	any user PTEs change.  This interface provides a notification
-	to architecture specific code to take appropiate action.
+	to architecture specific code to take appropriate action.
 
 
 Next, we have the cache flushing interfaces.  In general, when Linux