Stable instrumentations can change produced telemetry for bugfixes

[pellared]

https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/telemetry-stability.md

Such instrumentations are prohibited from changing any produced telemetry.

and

After the moratorium is lifted, stable instrumentations are allowed to change the produced telemetry if all the following conditions are fulfilled:

• The change is part of OpenTelemetry semantic conventions and is in a released version of the specification.
• The change has a corresponding published OpenTelemetry Schema File that describes the change.
• The produced telemetry correctly specifies the respective Schema URL.

I think it we should explicitly callout that changes related to bugfixes and security patches are allowed.

Related to:

• Instrumentation.AspNetCore and Instrumentation.Http 1.8.1 have illegal breaking changes in the produced telemetry opentelemetry-dotnet#5541

CC @trask , @lmolkova , @CodeBlanch

[pellared]

It might be closed because of open-telemetry/semantic-conventions#860 (comment)

However, it may be worth to make it more clear or change some wording as e.g.

Such instrumentations are prohibited from changing any produced telemetry

gives an impression that nothing can be changed.