showcases: doc: framepreemption: fixed literalinclude

Author: adamgeorge309

showcases/tsn/framepreemption/doc/index.rst

@@ -196,7 +196,7 @@ We use the following traffic for the ``RealisticFifoQueueing``, ``RealisticPrior
 and ``RealisticFramePreemption`` configurations:
 
 .. literalinclude:: ../omnetpp.ini
-   :start-after: Config RealisticBase
+   :start-at: background traffic
    :end-before: Config RealisticFifoQueueing
    :language: ini
 

showcases/tsn/framepreemption/omnetpp.ini

@@ -71,11 +71,11 @@ description = "Transmission of low priority frames are preempted by high priorit
 [Config RealisticBase]
 abstract = true
 
-# background
+# background traffic ~96Mbps
 *.host1.app[0].source.packetLength = 1200B
 *.host1.app[0].source.productionInterval = truncnormal(100us,50us)
 
-# time-sensitive
+# time-sensitive traffic ~9.6kbps
 *.host1.app[1].source.packetLength = 120B
 *.host1.app[1].source.productionInterval = truncnormal(10ms,5ms)