[SVLS] link to the web app terraform module

[ava-silver]

What does this PR do? What is the motivation?

Similar to #31752 but for web apps

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[ava-silver]

• [SVLS] link to the web app terraform module #31757 👈 (View in Graphite)
• master

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[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/ava.silver/svls/link-to-the-terraform-module/serverless/azure_app_service/linux_code
• https://docs-staging.datadoghq.com/ava.silver/svls/link-to-the-terraform-module/serverless/azure_app_service/linux_container
• https://docs-staging.datadoghq.com/ava.silver/svls/link-to-the-terraform-module/serverless/azure_app_service/windows_code