Update sample xml to match structure name for test.

[kggilmer]

Issue #, if available: N/A

Description of changes:

• Update text Xml to match structure name
• It's expected that this will enable the test to pass if protocol implementation is compiliant

Response from @kstich from internal discussion:

It's possible, would need to validate by updating and running another SDK's tests. I think others might not be validating the name of the root node for the response when deserializing.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.