Assorted spelling fixes.
diff --git a/include/objbase.h b/include/objbase.h
index 5112612..5f58bb0 100644
--- a/include/objbase.h
+++ b/include/objbase.h
@@ -98,7 +98,7 @@
* - Finally the set of 'IDirect3D_Xxx' macros is a standard set of macros defined to ease access
* to the interface methods in C. Unfortunately I don't see any way to avoid having to duplicate
* the inherited method definitions there. This time I could have used a trick to use only one
- * macro whatever the number of parameters but I prefered to have it work the same way as above.
+ * macro whatever the number of parameters but I preferred to have it work the same way as above.
* - You probably have noticed that we don't define the fields we need to actually implement this
* interface: reference count, pointer to other resources and miscellaneous fields. That's
* because these interfaces are just that: interfaces. They may be implemented more than once, in
