message: Fixed incorrect scheduler number in Math Component tutorial
diff: @@ -2102,7 +2102,7 @@ The `MathReceiver` component does not have a thread of its own, but relies on th
  ```xml
  <!-- Scheduler Connection -->
  <connection name = "MathReceiverRG">
  - <source component = "rateGroup1Comp" port = "RateGroupMemberOut" type = "Sched" num = "3"/>
  + <source component = "rateGroup1Comp" port = "RateGroupMemberOut" type = "Sched" num = "4"/>
  <target component = "mathReceiver" port = "SchedIn" type = "Sched" num = "0"/>
  </connection>
  ```
  