docs: Add Parallel Tool Calls experimental feature documentation

[SannidhyaSah]

Summary

This PR adds comprehensive documentation for the Parallel Tool Calls experimental feature.

Changes

• New documentation page:

  • Explains what parallel tool calls are and how they work
  • Provides configuration examples
  • Details use cases and best practices
  • Includes limitations and considerations

• Updated experimental features index:

  • Added parallel tool calls entry with description
  • Added 'parallel' keyword for better discoverability

• Updated sidebar:

  • Added parallel-tool-calls to the Experimental section

• Fixed run-slash-command documentation:

  • Added sidebar_label for consistent navigation
  • Fixed H1 title formatting

Documentation Preview

The new page provides:

• Clear explanation of the feature and its benefits
• Step-by-step configuration instructions
• Visual examples of how parallel execution works
• Best practices for optimal usage
• Known limitations and edge cases

---

Important

Adds documentation for the Parallel Tool Calls experimental feature, updates the experimental features index, and fixes formatting in the run-slash-command documentation.

• Documentation:
  • Adds parallel-tool-calls.md to document the Parallel Tool Calls feature, explaining its purpose, configuration, use cases, and limitations.
  • Updates experimental-features.md to include Parallel Tool Calls in the list of experimental features.
  • Fixes formatting in run-slash-command.md by adding sidebar_label and correcting H1 title.
• Sidebar:
  • Adds parallel-tool-calls to the Experimental section in sidebars.ts.

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Re-review completed. No new issues found.

The latest commit removes provider-specific model details from the prerequisites section, making the documentation more maintainable and future-proof. The change is clean and improves the docs.

Previous reviews

• 1e22b02: Review #1

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