Port System.Diagnostics triple slash to docs

[carlossanlop]

Ported using DocsPortingTool.

@gewarren I'm targeting the net6-rc1 branch.

[ghost]

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Issue Details

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Ported using DocsPortingTool.

@gewarren I'm targeting the net6-rc1 branch.

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

[tommcdon]

LGTM - thank you!

[opbld34]

Docs Build status updates of commit 16509d9:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Diagnostics.Metrics/Counter`1.xml	✅Succeeded	View
xml/System.Diagnostics.Metrics/Histogram`1.xml	✅Succeeded	View
xml/System.Diagnostics.Metrics/Instrument`1.xml	✅Succeeded	View
xml/System.Diagnostics/CounterSample.xml	✅Succeeded	View
xml/System.Diagnostics/EventLogEntryCollection.xml	✅Succeeded	View
xml/System.Diagnostics/TagList.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.

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