docs: fix GitHub capitalization in webhook docs

[ravindudanthanarayana]

Purpose

Correct the capitalization of the GitHub product name in the image alt text to match the official branding and improve documentation consistency.

Approach

Updated the image alt text by changing Github to GitHub without modifying the image or surrounding documentation.

Related Issues

N/A

Checklist

• Tests added or updated (unit, integration, etc.)
• Samples updated (if applicable)
• Added backport/<release-branch> label if this should be backported (e.g., backport/release-v1.0)

Remarks

Documentation-only change.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: a9f8760c-417d-4c75-97de-cb98c5b02487

📥 Commits

Reviewing files that changed from the base of the PR and between e1e301b and cae9479.

📒 Files selected for processing (1)

• en/docs/develop/integration-artifacts/event/github-webhooks.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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