[R. Engine, Rules] Small updates

[pedrosousa]

No description provided.

[hyperlint-ai]

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PR Change Summary

Updated terminology and clarified the application of response header transformation rules in the documentation.

• Clarified that Response Header Transform Rules apply to default Cloudflare error pages and custom error pages.
• Updated terminology from 'request header modification' to 'request header transform rule' for consistency.

Modified Files

• src/content/docs/rules/transform/response-header-modification/index.mdx
• src/content/docs/workers/configuration/versions-and-deployments/gradual-deployments.mdx

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[github-actions]

Preview URL: https://97a6af8e.preview.developers.cloudflare.com
Preview Branch URL: https://pedro-2025-04-24-reng-rules-small-updates.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/rules/transform/response-header-modification/	https://pedro-2025-04-24-reng-rules-small-updates.preview.developers.cloudflare.com/rules/transform/response-header-modification/
https://developers.cloudflare.com/workers/configuration/versions-and-deployments/gradual-deployments/	https://pedro-2025-04-24-reng-rules-small-updates.preview.developers.cloudflare.com/workers/configuration/versions-and-deployments/gradual-deployments/