Update gateway timeout docs with new configs

[O-sura]

Purpose

This PR adds the latest updated documentation for configuring timeouts in WSO2 API Platform gateway

• Related to: Adding end-to-end Timeout Functionality for Platform Gateway api-platform#1000

Checklist

• Verified that llms.txt (located at en/docs/llms.txt) is updated for AI readiness content.
• Ensured meaningful alt text for images and that the information contained in an image also appears in text so the relevant info exists in the body of the document.
• Added or updated frontmatter for the respective pages.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 2a941edf-e4a6-4582-8eec-1e4bfe1ebcc3

📥 Commits

Reviewing files that changed from the base of the PR and between e9cf4f0 and 394f4a0.

📒 Files selected for processing (3)

• en/docs/api-gateway/setup/upstream-timeouts.md
• en/docs/llms.txt
• en/mkdocs.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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