docs: Remove the leftover mention of row filtering from the docs

[alco]

We stopped using row filtering in e5f79c3.

Summary by CodeRabbit

• Documentation
  • Removed "Row filtering" content from the Shapes guide documentation.

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[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request removes duplicate "Row filtering" subsections from the Shapes documentation guide, eliminating explanatory content about row filtering optimization and related caveats. Six documentation lines are deleted with no additions.

Changes

Cohort / File(s)	Change Summary
Documentation Updates website/docs/guides/shapes.md	Removed two "Row filtering" subsections containing explanatory content about row filtering usage for minimizing replication data and caveat about unavailability for custom data types in where clauses

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 A rabbit's ode to clarity

Duplicate whispers fade away,
Words we don't need here to stay,
Shapes grow lighter, docs refined,
Simplicity—the cleaner mind! 📚✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The title accurately describes the main change: removing mentions of row filtering from documentation that were left behind after a previous removal.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

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