Add missing doc to the Metrics APIs and TimeOnly type.

[tarekgh]

dotnet/runtime#72409
dotnet/runtime#72404

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Issue Details

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dotnet/runtime#72409
dotnet/runtime#72404

Author:	tarekgh
Assignees:	tarekgh
Labels:	area-System.Diagnostics
Milestone:	-

[tarekgh]

@carlossanlop could you please have a look?

[carlossanlop]

Thanks, @tarekgh . I left some suggestions.

[carlossanlop]

Two more additional suggestions to use cref. Aside from that, LGTM.

[opbld32]

Docs Build status updates of commit 1b49c3d:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Diagnostics.Metrics/Meter.xml	✅Succeeded	View
xml/System.Diagnostics.Metrics/ObservableUpDownCounter`1.xml	✅Succeeded	View
xml/System/TimeOnly.xml	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel

[opbld33]

Docs Build status updates of commit 3d7372e:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Diagnostics.Metrics/Meter.xml	✅Succeeded	View
xml/System.Diagnostics.Metrics/ObservableUpDownCounter`1.xml	✅Succeeded	View
xml/System/TimeOnly.xml	✅Succeeded	View

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel