[APM] docs: add more API information #68717
Merged
+71
−26
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Summary
It has become clear through user reports that linking to the Kibana REST API documentation is not sufficient for documenting the new APM APIs. This PR adds documentation around the three request headers needed to interact with these APIs, and clarifies that you cannot use the dev console as these are not ES APIs.
Related issues
Closes elastic/apm#275.