fixed typo and updated KQL issues

[seanluce]

Overview/Summary

Found a small typo changed "zone" -> "region".

Updated and tested KQL for ANF-6 and ANF-7. Previous KQL was showing positive results instead of negative results.

Related Issues/Work Items

n/a

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• To associate an ADO Work Item, use the key word AB# succeeded with the ADO Work Item ID.

This PR fixes/adds/changes/removes

1. one small typo to _index
2. anf-6.kql
3. anf-7.kql

Breaking Changes

n/a

As part of this Pull Request I have

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

[seanluce]

Tested KQL for previously submitted ANF-6

[seanluce]

Tested KQL for previously submitted ANF-7

[ejhenry]

LGTM