Fix typo in the Profiles Data Model

[yanglong1010]

Could I have a review of this simple typo fix ? I would appreciate it.

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[dmathieu]

I think at this stage, it would make more sense to fix this directly in the proto. https://github.com/open-telemetry/opentelemetry-proto/blob/main/opentelemetry/proto/profiles/v1experimental/profiles.proto

[yanglong1010]

@dmathieu Thanks for you advice.