Make span kind description softer and closer the the spec #1971
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Spec language is soft in regards to clients/server span relationships:
https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/trace/api.md#spankind
Server span does not need to have a parent, it could also be that multiple server instrumentations that are not aware of each other create server->server spans. While not ideal, this is a reality.
Client spans can be nested under other client spans. E.g. DB ORM creates a client span and the underlying DB driver creates a client span. They are unaware of each other and have no knowledge if they are both enabled in the same application.