Update docfx.json to enable zone pivots

[msewaweru]

This repo does not support zone pivots. This change is to update the docfx.json file and test this feature.

[learn-build-service-prod]

Learn Build status updates of commit 05d3402:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
microsoftgraph/docfx.json	❌Error		Details

microsoftgraph/docfx.json

• Line 13, Column 1: [Error: json-syntax-error] After parsing a value an unexpected character was encountered: ".

For more details, please refer to the build report.

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[learn-build-service-prod]

Learn Build status updates of commit 387f724:

✅ Validation status: passed

File	Status	Preview URL	Details
microsoftgraph/docfx.json	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[timayabi2020]

Could you please put some description on what this change is supposed to do or the issue is supposed to address?