Update auto_instrumentation.md

[yahya-mouman]

Update docs to include all the newly traced methods for langchain.

What does this PR do? What is the motivation?

Merge instructions

• [ ] Please merge after reviewing

Additional notes

[github-actions[bot]]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/yahya/update-langchain-traced-methods/llm_observability/setup/auto_instrumentation

[estherk15]

Whenever this is ready to merge, you can add it to the merge queue by commenting /merge

[yahya-mouman]

/merge

[dd-devflow[bot]]

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2024-12-09 15:33:48 UTC :information_source: MergeQueue: waiting for PR to be ready

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2024-12-09 15:50:57 UTC :information_source: MergeQueue: merge request added to the queue

The median merge time in master is 6m.