Fix off-by-one error

Iterate from 0..9, i.e. while $t0 is < 10

mips.html.markdown

@@ -213,8 +213,9 @@ gateways and routers.
     # instruction to continue its execution
     li $t0, 0
     while:
-      bgt $t0, 10, end_while                # While $t0 is less than 10, 
+      bgt $t0, 9, end_while                 # While $t0 is less than 10, 
                                             # keep iterating
+      #actual loop content would go here
       addi $t0, $t0, 1                      # Increment the value
       j while                               # Jump back to the beginning of 
                                             # the loop