Update auto_instrumentation.md add openai responses nodejs

[jordan-wong]

What does this PR do? What is the motivation?

Adds a documentation bullet point for OpenAI responses instrumentation for the Node.js tracer DataDog/dd-trace-js#6583

Merge instructions

Merge readiness:

• Ready for merge

For Datadog employees:

Your branch name MUST follow the <name>/<description> convention and include the forward slash (/). Without this format, your pull request will not pass CI, the GitLab pipeline will not run, and you won't get a branch preview. Getting a branch preview makes it easier for us to check any issues with your PR, such as broken links.

If your branch doesn't follow this format, rename it or create a new branch and PR.

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Additional notes

[sabrenner]

thank you Jordan!

i think for getting a preview available in this repo you need to have the branch name as <your-name>/<feature> in the future, but seeing as this is a two line change i think this is fine, will let the docs team take a look as well!

[brett0000FF]

thank you Jordan!

i think for getting a preview available in this repo you need to have the branch name as <your-name>/<feature> in the future, but seeing as this is a two line change i think this is fine, will let the docs team take a look as well!

That is correct! I tested it locally though, and it looks good, so I approved. You won't be able to merge it because the build_preview will fail. Just @ me or ping me on Slack when it's ready to merge, and I can override and merge for us.