docs: Add DuckDB HNSW vector index support for accelerated views

[claudespice]

Summary

• Document that DuckDB HNSW vector indexes now work with accelerated views, not just datasets
• Add a view configuration example with HNSW vector search

Source PRs

• Add DuckDB HNSW vector index support for accelerated views spiceai#10695 — Add DuckDB HNSW vector index support for accelerated views

Changes

• website/docs/components/vectors/duckdb.md:
  • Updated intro text to mention "dataset or view" instead of just "dataset"
  • Added a "View example" section with a complete YAML configuration and SQL query example
  • Updated the Limitations section to say "dataset or view"

Test plan

• View example YAML matches the configuration structure from the source PR
• Links are valid
• Only vNext docs updated (feature is new)

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[github-actions]

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