docs: add HTTPException usage examples to exceptions reference

[sansyrox]

Summary

• Adds a new "Handling Errors" section to the exceptions API reference page showing how to use HTTPException with status_codes for error handling in route handlers
• Includes both typed and untyped code examples using Robyn's path parameter syntax
• Placed before the existing "Custom Exception Handler" section for logical flow

Supersedes #951

Test plan

• Verify the docs site renders the new section correctly
• Confirm code examples use valid Robyn API (HTTPException, status_codes, :param syntax)

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Project	Deployment	Actions	Updated (UTC)
robyn	Ready	Preview, Comment	Apr 11, 2026 11:45pm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 863f435b-8a30-448c-abed-05e6f38b1994

📥 Commits

Reviewing files that changed from the base of the PR and between 3e04c65 and e674ffe.

📒 Files selected for processing (1)

• docs_src/src/pages/documentation/en/api_reference/exceptions.mdx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/custom-exception-handling

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[codspeed-hq]

Merging this PR will not alter performance

✅ 189 untouched benchmarks

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_{Comparing docs/custom-exception-handling (e674ffe) with main (3e04c65)}