readme: link to m5ops.h as well

Author: cirosantilli

README.adoc

@@ -8386,7 +8386,10 @@ The executable `/m5ops.out` illustrates how to hard code with inline assembly th
 /m5ops.out r
 ....
 
-Source: link:kernel_module/user/m5ops.c[]
+Sources:
+
+* link:kernel_module/user/m5ops.h[]
+* link:kernel_module/user/m5ops.c[]
 
 That executable is of course a subset of <<m5>> and useless by itself: its goal is only illustrate how to hardcode some <<m5ops>> yourself as one-liners.