Clarify telemetry library resource attributes (#494)
Clarify telemetry library resource attributes (#494)

* Clarify telemetry library resource attributes

* Fix typo

Co-Authored-By: Wolfgang Ziegler <43dc04569bfcf1df8bbd6902f9ec662131e3271b@dynatrace.com>

* Clarify non-default SDK name

* `opentelemetry-sdk` -> `opentelemetry`

* Refine description

* Clarify responsibilities

Co-authored-by: Wolfgang Ziegler <43dc04569bfcf1df8bbd6902f9ec662131e3271b@dynatrace.com>
open-telemetry/opentelemetry-specification,open-telemetry/opentelemetry-specification