ot-shim: document the omission of scope manager

[dyladan]

There was an issue in opentracing to add a scope manager, but it doesn't look like it was ever implemented opentracing/opentracing-javascript#112

What is our action item here? Should we just document on the shim that there is no scope manager so we have no shim for it?

Originally posted by @dyladan in open-telemetry/opentelemetry-specification#2219 (comment)

[mercybassey]

@dyladan Hi. I am an Outreachy Applicant. Since this is a good first issue can I give it a try?

[pichlermarc]

@mercybassey looks like @Asheklm6 has closed their PR feel free to give this a try. 🙂

[mercybassey]

@mercybassey looks like @Asheklm6 has closed their PR feel free to give this a try. 🙂

Sure