Fix Orleans custom grain storage docs: replace removed AddSingletonNamedService with AddKeyedSingleton

[Copilot]

• Update custom-grain-storage.md text to replace AddSingletonNamedService references with AddKeyedSingleton
• Remove the outdated inline code block showing the old AddSingletonNamedService API
• Fix broken xref: change KeyedServiceExtensions.AddKeyedSingleton → ServiceCollectionServiceExtensions.AddKeyedSingleton
• Update ms.date frontmatter and add ai-usage: ai-assisted

Original prompt

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This section details on the original issue you should resolve

<issue_title>Documentation not revised according to reported problem</issue_title>
<issue_description>### Type of issue

Code doesn't work

Description

See:
Is the Grain File Storage Example Still Valid in Orleans 9?
And now also for version 10

Page URL

https://learn.microsoft.com/en-us/dotnet/orleans/tutorials-and-samples/custom-grain-storage?pivots=orleans-10-0

Content source URL

https://github.com/dotnet/docs/blob/main/docs/orleans/tutorials-and-samples/custom-grain-storage.md

Document Version Independent Id

5f0db119-a02e-55fc-ac0f-a04ad2cfc2a1

Platform Id

bc76f793-9bac-a2a8-96e7-c600f8e1885e

Article author

@meaghanlewis

Metadata

• ID: 494f78b0-7801-5554-643c-bfda075ce7f4
• PlatformId: bc76f793-9bac-a2a8-96e7-c600f8e1885e
• Service: dotnet-orleans

Related Issues</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Documentation not revised according to reported problem #51324

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Internal previews

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docs/orleans/tutorials-and-samples/custom-grain-storage.md	docs/orleans/tutorials-and-samples/custom-grain-storage

[Copilot]

Pull request overview

Updates the custom grain storage tutorial text to align with Orleans 9+ by removing references to removed Orleans-internal named-service DI APIs and describing the current keyed DI approach.

Changes:

• Updated frontmatter metadata (ms.date, added ai-usage).
• Replaced prose referencing AddSingletonNamedService / GetRequiredServiceByName with .NET keyed DI (AddKeyedSingleton).
• Removed the inline “old (broken)” code block describing the removed Orleans API.

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