Update make_markdown_outils.sh

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failed make_markdown_outils #38782

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make_markdown_outils Build
    
or you can specify the notebooks list in a config file, containing::

c.NbConvertApp.notebooks = ["my_notebook.ipynb"]

> jupyter nbconvert --config mycfg.py

cp: cannot stat 'Rgraphics.md': No such file or directory
ERROR: Job failed: exit code 1