Better comment in assembly listing

Author: cpq

README.md

@@ -902,7 +902,7 @@ and compare generated machine code:
   ldr     r3, [r3, #0]  // in r3         |  ldr     r3, [r2, #0]   // r3 = s_ticks
   adds    r0, r3, r0    // r0 = r3 + ms  |  adds    r3, r3, r0     // r3 = r3 + ms
                                          |  ldr     r1, [r2, #0]   // RELOAD: r1 = s_ticks
-  cmp     r3, r0        // compare       |  cmp     r1, r3         // compare
+  cmp     r3, r0        // ALWAYS FALSE! |  cmp     r1, r3         // compare
   bcc.n   200000d2 <delay+0x6>           |  bcc.n   200000d2 <delay+0x6>
   bx      lr                             |  bx      lr
 ```