Replacing ~ with -

Author: jmlarson1

docs/platforms/platforms_index.rst

@@ -134,7 +134,7 @@ and partitions these to workers. The :doc:`MPI Executor<../executor/mpi_executor
 accesses the resources available to the current worker when launching tasks.
 
 Zero-resource workers
-~~~~~~~~~~~~~~~~~~~~~
+---------------------
 
 Users with persistent ``gen_f`` functions may notice that the persistent workers
 are still automatically assigned system resources. This can be resolved by using