format issues on `literalinclude`

[germa89]

The rST code:

Helper functions
----------------

Additionally, for printing purposes, several helper functions are defined:

.. literalinclude:: ml_ga_beam.py
    :language: python
    :start-at: import numpy as np
    :end-at: print("=============")

which renders as:

https://mapdl.docs.pyansys.com/version/stable/examples/extended_examples/hpc/hpc_ml_ga.html#helper-functions

For completeness the Python code: https://github.com/ansys/pymapdl/blob/9580a45136331a2f5ed00be20eeabb2cf9195b3c/doc/source/examples/extended_examples/hpc/ml_ga_beam.py#L133-L142

[Revathyvenugopal162]

related to #643