Overview/Summary

Fixed the description of Leverage Azure Policy inheritance model because Azure Policy and Azure Firewall policy are different.

Related Issues/Work Items

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[x] Read the Contribution Guide and ensured this PR is compliant with the guide
[x] Checked for duplicate Pull Requests
[x] Associated it with relevant GitHub Issues or ADO Work Items (Internal Only)
[x] Ensured my code/branch is up-to-date with the latest changes in the main branch
[ ] Ensured PR tests are passing
[x] Performed testing and provided evidence (e.g. screenshot of output) for any changes associated to ARG queries
- Tested with hugo on my local machine.
[x] Updated relevant and associated documentation (e.g. Contribution Guide, Docs etc.)