Bug in example (within main function)

[Ron Ritchey]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [X] This doc is inaccurate in this way: Example code has a bug
- [ ] This is a doc addition request.
- [X] I have a fix to the document that I can paste below including example: input and output.

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Release: 0.0.1.dev228 on 2021-01-21 16:53:50
SHA: d4785ae6fdb8b9fd87748b508c10622f6c0ae027
Source: https://opendev.org/openstack/ossa/src/doc/source/guidelines/dg_using-file-paths.rst
URL: https://security.openstack.org/guidelines/dg_using-file-paths.html

if is_safe_path(os.getcwd(), path):

should instead be...

if is_safe_path(os.getcwd(), arg):

[Gage Hugo (gagehugo)]

Marking this one as a duplicate since it's by the same reporter and the other one has more details.