Update prototype_source/flight_recorder_tutorial.rst

Co-authored-by: Svetlana Karslioglu <[email protected]>

Author: c-p-i-o

prototype_source/flight_recorder_tutorial.rst

@@ -203,7 +203,7 @@ Caveat: tabulate module is needed, so you might need pip install it first.
   torchfrtrace <dump dir containing trace files> -j [--selected-ranks i j k ...] [--pg-filters 0 2]
 
 An End-to-End Example
----------------
+------------------------------------
 To demonstrate the use of Flight Recorder, we will use a small program where we induce mismatched collectives.
 In this example, ``rank0`` is programmed to do an additional collective.
 We write out Flight Recorder dump files to the `/tmp`` directory.