Document BreakForUserUnhandledException and DebuggerDisableUserUnhadledExceptionsAttribute

[tommcdon]

Summary

Documents the following missing items added during .NET 9

Summary	Parameters	TypeParameters	ReturnValue	API
Missing	Missing	NA	NA	M:System.Diagnostics.Debugger.BreakForUserUnhandledException(System.Exception)
Missing	NA	NA	NA	M:System.Diagnostics.DebuggerDisableUserUnhandledExceptionsAttribute.#ctor
Missing	NA	NA	NA	T:System.Diagnostics.DebuggerDisableUserUnhandledExceptionsAttribute

Fixes dotnet/runtime#105980

[dotnet-policy-service]

Tagging subscribers to this area: @tommcdon

[tommcdon]

@gewarren @carlossanlop

[learn-build-service-prod]

Learn Build status updates of commit 66866d2:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
xml/System.Diagnostics/DebuggerDisableUserUnhandledExceptionsAttribute.xml	⚠️Warning	View	Details
xml/System.Diagnostics/Debugger.xml	✅Succeeded	View

xml/System.Diagnostics/DebuggerDisableUserUnhandledExceptionsAttribute.xml

• Line 0, Column 0: [Warning: disallowed-html-tag - See documentation] HTML tag 'see' isn't allowed. Replace it with approved Markdown or escape the brackets if the content is a placeholder.

For more details, please refer to the build report.

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[tommcdon]

@gewarren I believe all feedback has been addressed. There is a new warning caused by the <see> tag in the summary section of the docs, but I see other <see> directives in other sections, so not sure what it is getting flagged. The preview notes look correct to me.

[tommcdon]

@gewarren sorry for the additional ping, please let me know if there is any additional feedback on this PR

[gewarren]

see cref must be converted to xref in Markdown sections.

[learn-build-service-prod]

Learn Build status updates of commit ad90489:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Diagnostics/Debugger.xml	✅Succeeded	View
xml/System.Diagnostics/DebuggerDisableUserUnhandledExceptionsAttribute.xml	✅Succeeded	View

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel