Clarify confusing aspects of exemplar specification. (#2201)
Clarify confusing aspects of exemplar specification. (#2201)

* Clarify confusing aspects of exemplar specification.

* Fixes from review.

* markdown fix.

* Update specification/metrics/sdk.md

Co-authored-by: James Moessis <37edc9c9472d4f2b7c4c47f6c09154e6973f6901@gmail.com>

* More fixes from review.

* Fix spelling.

Co-authored-by: James Moessis <37edc9c9472d4f2b7c4c47f6c09154e6973f6901@gmail.com>
open-telemetry/opentelemetry-specification,open-telemetry/opentelemetry-specification