OpenAI instrumentation docs fixes

[lmolkova]

• updates broken homepage link to https://pypi.org/project/opentelemetry-instrumentation-openai-v2
• adds docs config
• adds usage samples to readme

[gyliu513]

This only happens when OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT is set as true, right? Can we highlight the parameter here as well?

[dasiths]

Might be worthwhile putting the example (json) format of the content shape that is emitted.

Also might be worth stating that if doing this you may have to configure your pipeline to redact any sensitive info contained in the content.

[lmolkova]

All examples can be found in semantic conventions - https://github.com/open-telemetry/semantic-conventions/blob/main/docs/gen-ai/gen-ai-events.md and it'd be hard to keep them in sync if we duplicate.

I don't think we should have a redaction example specific to OpenAI instrumentation.

[lzchen]

Another nit about the zero-code example. opentelemetry-instrument will use otlp and grpc by default, which differs slightly from the coded example that uses otlp/http.

If you want to modify the zero-code example to use EXACTLY the same components, you will also have to set metrics to None explicitly:

dotenv run -- opentelemetry-instrument --traces_exporter otlp_proto_http --metrics_exporter None --logs_exporter otlp_proto_http python main.py

[lzchen]

Users will also need to set env var OTEL_PYTHON_LOGGING_AUTO_INSTRUMENTATION_ENABLED to true to enable autoinstrumentation of logging.

[lzchen]

Some additional comments.