Add viewport config to browser pool examples

[mintlify]

Summary

• Added viewport configuration (1280x800) to TypeScript and Python examples in the Create a pool section
• Replaced "stealth mode" with "supported viewports" in pool configuration options description

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Note

Low Risk
Low risk documentation-only change that updates example parameters and wording, with no runtime or API behavior changes.

Overview
Updates browsers/scaling/pools.mdx to include a viewport (1280x800) in both the TypeScript and Python “Create a pool” examples.

Adjusts the pool configuration options description to mention supported viewports instead of stealth mode.

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