Description:

Users trying to configure OTLP*Exporter (from @opentelemetry/exporter-metrics-otlp-proto or similar) have no easy way to discover the relevant configuration options through the README chain.

Proposed Solution

• Document all options available on OTLPExporterNodeConfigBase
  • using tsdoc on the type
  • in the @opentelemetry/otlp-exporter-base README (including httpAgentOptions and any other shared config fields)
• Add a easy-to-find link in each individual OTLP http exporter README (e.g. exporter-metrics-otlp-proto, exporter-trace-otlp-proto, etc.) pointing to @opentelemetry/otlp-exporter-base for shared options

Out of scope

• Fixing broken type links in auto-generated API docs (separate issue)