Refine configuration design docs (#1841)
Refine configuration design docs (#1841)

* Refine configuration design docs

* Remove repetition

* Fix typo

* Unify code blocks

Co-authored-by: Tyler Yahn <b79042b10fd9cd75597e3dac7c4e4fe9e14fe996@users.noreply.github.com>
open-telemetry/opentelemetry-go,open-telemetry/opentelemetry-go