[all hosts] Add article about platform-specific reqt. sets

[ElizabethSamuel-MSFT]

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[learn-build-service-prod]

Learn Build status updates of commit 1ba8574:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/develop/platform-specific-requirement-sets.md	✅Succeeded	View
docs/toc.yml	✅Succeeded	View

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[learn-build-service-prod]

Learn Build status updates of commit 8a3a365:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/develop/platform-specific-requirement-sets.md	✅Succeeded	View
docs/toc.yml	✅Succeeded	View

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

[learn-build-service-prod]

Learn Build status updates of commit 60fd764:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/develop/platform-specific-requirement-sets.md	✅Succeeded	View
docs/toc.yml	✅Succeeded	View

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