[ENTITY - DeleteEntity]: Updated C# example to resolve errors

[JayPaulinCodes]

Summary

Updated the DeleteEntity native documentation to fix the C# example code which did not work in the provided state

Validating Example(s)

Contribution Guidelines Acknowledgement

Before you submit this PR, please make sure:

• You have read the contribution guidelines
• You include an example that validates your change
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[AvarianKnight]

LGTM