docs: update langchain-oracledb documentation

[fileames]

Oracle AI Vector Search integrations for LangChain have been moved to a dedicated package, langchain-oracledb , and a new repository, langchain-oracle . This PR updates the corresponding documentation, including installation instructions and import statements, to reflect these changes.

This PR is complemented with: langchain-ai/langchain-community#283

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
langchain	Ready	Preview	Comment	Sep 12, 2025 9:01pm

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32805 will improve performances by 11.48%

_{Comparing rohanaggarwal7997:documentation_oracledb (0b7e849) with master (338d3d2)}

⚠️ Unknown Walltime execution environment detected

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For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

⚡ 1 improvement
✅ 12 untouched

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
⚡	test_import_time[RunnableLambda]	560.7 ms	502.9 ms	+11.48%

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32805 will not alter performance

_{Comparing rohanaggarwal7997:documentation_oracledb (0b7e849) with master (338d3d2)}

Summary

✅ 14 untouched

[mdrxy]

Hello! Thank you for your patience - we've been in the middle of a docs hiatus while we port things over to the new docs site.

I'll merge this, but I'd ask that you synchronize the changes to the new docs repo, as these changes will soon become invisible as we deprecate the current docs pages.

Please view the new contributing guide for further info. Don't hesitate to ask questions, as we've rewritten parts of it and may have missed something.

I've opened an issue in the new repo - when you make the new PR, make sure to include the words Fixes #523 so that the issue is automatically closed when the changes are merged in.