Fix bruxism-inducing typo so I can sleep at night.

include/my_global.h

@@ -692,7 +692,7 @@ typedef long long	my_ptrdiff_t;
 #define ALIGN_SIZE(A)	MY_ALIGN((A),sizeof(double))
 /* Size to make adressable obj. */
 #define ALIGN_PTR(A, t) ((t*) MY_ALIGN((A),sizeof(t)))
-			 /* Offset of filed f in structure t */
+			 /* Offset of field f in structure t */
 #define OFFSET(t, f)	((size_t)(char *)&((t *)0)->f)
 #define ADD_TO_PTR(ptr,size,type) (type) ((byte*) (ptr)+size)
 #define PTR_BYTE_DIFF(A,B) (my_ptrdiff_t) ((byte*) (A) - (byte*) (B))