Fix a bunch of spelling mistakes :\

src/simulator-arm.h

Index: src/simulator-arm.h
diff --git a/src/simulator-arm.h b/src/simulator-arm.h
index ccb3e802a5ac72dff97177a1c1fd47080f737e98..4f3c53d41713f5d1cdb2b600c9c80e2134595344 100644
--- a/src/simulator-arm.h
+++ b/src/simulator-arm.h
@@ -106,7 +106,7 @@ class Simulator {
   void Execute();
 
   // V8 generally calls into generated code with 5 parameters. This is a
-  // convenience funtion, which sets up the simulator state and grabs the
+  // convenience function, which sets up the simulator state and grabs the
   // result on return.
   v8::internal::Object* Call(int32_t entry, int32_t p0, int32_t p1,
                              int32_t p2, int32_t p3, int32_t p4);