seminaries/qtrvsim/branchpred-1: correct count in the comment

Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>

seminaries/qtrvsim/branchpred-1/branchpred-1.S

 # i = s0, j = s1, c = s2, t0 = outer loop limits, t1 = inner loop limit, t3 - auxiliary variable
 
   addi s1, zero, 0     # c = 0;
-  addi t0, zero, 4     # t0 = 500;
+  addi t0, zero, 4     # t0 = 4;
   addi t1, zero, 5     # t1 = 2
 
   addi s0, zero, 0     # i = 0;