Port System.Text documentation

[carlossanlop]

@dotnet/area-system-text-encoding @tarekgh @GrabYourPitchforks

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Issue Details

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@dotnet/area-system-text-encoding @tarekgh @GrabYourPitchforks

Author:	carlossanlop
Assignees:	carlossanlop
Labels:	area-System.Text.Encoding
Milestone:	-

[learn-build-service-prod]

Learn Build status updates of commit 4f0abda:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Text/Ascii.xml	✅Succeeded	View
xml/System.Text/ASCIIEncoding.xml	✅Succeeded	View
xml/System.Text/CompositeFormat.xml	✅Succeeded	View
xml/System.Text/Encoding.xml	✅Succeeded	View
xml/System.Text/Rune.xml	✅Succeeded	View
xml/System.Text/StringBuilder.xml	✅Succeeded	View
xml/System.Text/UTF8Encoding.xml	✅Succeeded	View

For more details, please refer to the build report.

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