fix(docs): correct package name from langchain-google_vertexai to langchain-google-vertexai for VertexAILLM

[bansalkanav]

• Description: This PR updates the package field for the VertexAI integration in the documentation metadata. The original value was langchain-google_vertexai, which has been corrected to langchain-google-vertexai to reflect the actual package name used in PyPI and LangChain integrations.
• Issue: N/A
• Dependencies: None
• Twitter handle: N/A

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Name	Status	Preview	Comments	Updated (UTC)
langchain	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 18, 2025 6:41am

[codspeed-hq]

CodSpeed WallTime Performance Report

Merging #32095 will not alter performance

_{Comparing bansalkanav:patch-2 (3350238) with master (22535eb)}

⚠️ 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

✅ 13 untouched benchmarks

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #32095 will not alter performance

_{Comparing bansalkanav:patch-2 (3350238) with master (22535eb)}

Summary

✅ 14 untouched benchmarks