update extraction guides (vdbs, custom-metadata, multimodal-extraction)

[kheiss-uwzoo]

Summary

Updates documentation under docs/docs/extraction/ only:

• vdbs.md — Vector database guidance for extraction workflows.
• custom-metadata.md — How custom metadata applies in extraction.
• multimodal-extraction.md — Multimodal extraction concepts and usage.

No other paths are changed in this pull request.

[greptile-apps]

Greptile Summary

This PR updates three extraction documentation pages (vdbs.md, custom-metadata.md, multimodal-extraction.md) with link enrichment, admonition format alignment, and a code-example correction. No source code is changed.

• vdbs.md: Adds secondary documentation links (LanceDB docs, OpenSearch vector-search, Elasticsearch, Pinecone homepage, Teradata homepage) to the VDB backends and partner tables; promotes the "Related" bold block to a ### More information sub-heading; strips stray bold markers from prose and the hybrid-query note; removes extra blank lines.
• custom-metadata.md: Removes the dense_dim=2048 argument from the vdb_upload code example, aligning the snippet with the current LanceDB operator interface.
• multimodal-extraction.md: Replaces the GitHub-flavored > [!IMPORTANT] callout with a MkDocs Material !!! important admonition, matching the renderer used across the rest of the docs site.

Confidence Score: 5/5

Documentation-only changes with no source code impact; safe to merge.

All three files are Markdown documentation pages. The changes add hyperlinks, fix admonition syntax for the MkDocs renderer, remove a stale dense_dim argument from a code snippet, and clean up formatting. There are no logic paths, API contracts, or runtime behaviors modified.

No files require special attention.

Important Files Changed

Filename	Overview
docs/docs/extraction/custom-metadata.md	Removes the dense_dim=2048 argument from the vdb_upload code example; the rest of the file is unchanged.
docs/docs/extraction/multimodal-extraction.md	Converts the GitHub-flavored > [!IMPORTANT] callout to a MkDocs Material !!! important admonition, consistent with how the rest of the site renders admonitions.
docs/docs/extraction/vdbs.md	Adds documentation links to LanceDB, OpenSearch, Elasticsearch, Pinecone, and Teradata entries; promotes the "Related" bold block to a ### More information heading; removes stray bold markers; cleans up extra blank lines.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[vdbs.md] -->|adds doc links| B[LanceDB · OpenSearch · Elasticsearch · Pinecone · Teradata]
    A -->|promotes heading| C[### More information]
    A -->|strips bold markers| D[Prose & note cleanup]
    E[custom-metadata.md] -->|removes stale arg| F[dense_dim=2048 dropped from vdb_upload example]
    G[multimodal-extraction.md] -->|format swap| H[GitHub-flavor callout → MkDocs Material admonition]

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