Clarify automatic disposal for all service lifetimes in DI guidelines

[Copilot]

The "Disposal of services" section stated only that singletons are automatically disposed, leaving readers uncertain about transient and scoped service disposal behavior.

Changes

• Updated docs/core/extensions/dependency-injection/guidelines.md to document disposal timing for all three service lifetimes:
  • Transient: disposed at scope end
  • Scoped: disposed at scope end
  • Singleton: disposed at container disposal (application shutdown)
• Aligned terminology with service-lifetimes.md ("In apps that process requests")

The existing code examples and console output already demonstrated this behavior but lacked explicit documentation.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[UUF] Missing information</issue_title>
<issue_description>### Type of issue

Missing information

Description

Great info generally, but in the "Disposal of Services " section the following line is confusing: "If a type or factory is registered as a singleton, the container disposes the singleton automatically." Why mention the singleton case but not transient and scoped services? Are they not automatically disposed as well?

Page URL

https://learn.microsoft.com/en-us/dotnet/core/extensions/dependency-injection-guidelines

Content source URL

https://github.com/dotnet/docs/blob/main/docs/core/extensions/dependency-injection-guidelines.md

Document Version Independent Id

7fb2be80-cb54-27bf-4f93-423d8540429e

Platform Id

df1bff59-742c-a7b3-cfc6-4fc1f6510458

Article author

@gewarren

Metadata

• ID: 8d1c8ef1-6a01-df24-34ad-570f88df9303
• PlatformId: df1bff59-742c-a7b3-cfc6-4fc1f6510458
• Service: dotnet-fundamentals

Related Issues</issue_description>

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

• Fixes [UUF] Missing information #50747

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docs/core/extensions/dependency-injection/guidelines.md	Dependency injection guidelines

[Copilot]

Pull request overview

This PR clarifies the automatic disposal behavior for all three service lifetime types in the dependency injection guidelines documentation. The original issue raised confusion about whether transient and scoped services are also automatically disposed, since the documentation only explicitly mentioned singleton disposal.

Changes:

• Added explicit disposal timing documentation for transient, scoped, and singleton service lifetimes
• Structured the information as a bulleted list with disposal behavior for each lifetime type
• Included context about disposal timing in request-processing applications