Web: clarify maximumInstanceCount is per function group

[CooperLink]

Summary

Clarifies that the Flex Consumption maximumInstanceCount limit is the maximum number of on-demand instances per function group, not across the entire function app.

Updates the FunctionsScaleAndConcurrency.maximumInstanceCount description from:

"The maximum number of instances for the function app."

to:

"The maximum number of on demand instances per function group."

This matches the Flex Consumption scale-curve enforcement behavior.

Changes

• Source of truth: AppService/models.tsp (@doc on maximumInstanceCount)
• Regenerated emitted openapi.json for all TypeSpec-managed versions: 2025-03-01, 2025-05-01, 2026-03-01-preview, 2026-03-15, 2026-07-15

Description-only, non-breaking change. Pre-TypeSpec frozen versions (2023-12-01, 2024-04-01, 2024-11-01) are intentionally left unchanged.

Work item

AB#38015448

[github-actions]

Next Steps to Merge

Next steps that must be taken to merge this PR:

• ❌ This PR targets either the main branch of the public specs repo or the RPSaaSMaster branch of the private specs repo. These branches are not intended for iterative development. Therefore, you must acknowledge you understand that after this PR is merged, the APIs are considered shipped to Azure customers. Any further attempts at in-place modifications to the APIs will be subject to Azure's versioning and breaking change policies. Additionally, for control plane APIs, you must acknowledge that you are following all the best practices documented by ARM at aka.ms/armapibestpractices. If you do intend to release the APIs to your customers by merging this PR, add the PublishToCustomers label to your PR in acknowledgement of the above. Otherwise, retarget this PR onto a feature branch, i.e. with prefix release- (see aka.ms/azsdk/api-versions#release--branches).

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[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
Swagger	Microsoft.Web-AppService
TypeSpec	Microsoft.Web
Go	sdk/resourcemanager/appservice/armappservice
JavaScript	@azure/arm-appservice
Java	com.azure.resourcemanager:azure-resourcemanager-appservice
Python	azure-mgmt-web
C#	Azure.ResourceManager.AppService

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