.NET Interactive: Add try dotnet to batch 18c

[v-mepa]

fyi @mairaw

Add try dotnet to batch 18c

URL	Try .NET Status	Comments
https://docs.microsoft.com/en-us/dotnet/api/system.text.utf8encoding.getdecoder	Batch 18
https://docs.microsoft.com/en-us/dotnet/api/system.text.utf8encoding.getbytecount	Batch 18
https://docs.microsoft.com/en-us/dotnet/api/system.text.utf8encoding.getchars	Batch 18
https://docs.microsoft.com/en-us/dotnet/api/system.text.utf8encoding.getencoder	Batch 18
https://docs.microsoft.com/en-us/dotnet/api/system.text.utf8encoding.getcharcount	Batch 18
https://docs.microsoft.com/en-us/dotnet/api/system.text.utf8encoding.getmaxbytecount	Batch 18
https://docs.microsoft.com/en-us/dotnet/api/system.text.utf8encoding.equals	Batch 18
https://docs.microsoft.com/en-us/dotnet/api/system.text.utf8encoding.getmaxcharcount	Batch 18

[opbld31]

Docs Build status updates of commit c735ac6:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Text/UTF8Encoding.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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[mairaw]

Looks great. Thanks @v-mepa!