collector: internal telemetry page should document config options for OTLP

[codeboten]

What needs to be changed? Describe the update that is required.

The internal telemetry Collector document needs to include information about the configuration options that can be used to export telemetry via OTLP.

What is the name + path of the page that needs changed?
https://opentelemetry.io/docs/collector/internal-telemetry/

Additional context:
Related to #5702