Update functions-app-settings.md

[azarboon]

Added some explanation about WEBSITE_RUN_FROM_PACKAGE which make it easier to understand for beginners. Also, explained some quirks.

[prmerger-automator]

@azarboon : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 677c43d:

❌ Validation status: errors

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File	Status	Preview URL	Details
	❌Error		Details

• Line 0, Column 0: [Error: committish-not-found] Can't find branch, tag, or commit 'main' for repo https://github.com/Azure-Samples/azure-digital-twins-getting-started.

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[ShannonLeavitt]

Closing/reopening to refresh validation

[learn-build-service-prod]

Learn Build status updates of commit 677c43d:

❌ Validation status: errors

Please follow instructions here which may help to resolve issue.

File	Status	Preview URL	Details
	❌Error		Details

• Line 0, Column 0: [Error: committish-not-found] Can't find branch, tag, or commit 'main' for repo https://github.com/Azure-Samples/azure-digital-twins-getting-started.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
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[Jak-MS]

@ggailey777
Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[learn-build-service-prod]

Learn Build status updates of commit 677c43d:

💡 Validation status: suggestions

File	Status	Preview URL	Details
articles/azure-functions/functions-app-settings.md	💡Suggestion		Details

articles/azure-functions/functions-app-settings.md

• Line 750, Column 143: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/azure/azure-functions/functions-run-local' will be broken in isolated environments. Replace with a relative link.

For more details, please refer to the build report.

Note: Your PR may contain errors or warnings or suggestions unrelated to the files you changed. This happens when external dependencies like GitHub alias, Microsoft alias, cross repo links are updated. Please use these instructions to resolve them.

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