Fixed typo in String.Trim example

[jelopezf]

Summary

Trimmed had an extra m on the example.

[opbld30]

Docs Build status updates of commit 5820857:

✅ Validation status: passed

File	Status	Preview URL	Details
snippets/csharp/System/String/Trim/Trim1.cs	✅Succeeded	View

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[gewarren]

Thanks @jelopezf