[Docs Site] Add PartialsUsage component

[KianNH]

Summary

Add PartialsUsage component

[hyperlint-ai]

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PR Change Summary

Added the PartialsUsage component to enhance documentation on reusable Markdown snippets.

• Introduced the PartialsUsage component for improved documentation.
• Updated the Render component examples to include better formatting.
• Clarified usage instructions for the Render component parameters.

Modified Files

• src/content/docs/style-guide/components/render.mdx

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
*.astro	@cloudflare/developer-advocacy, @kristianfreeman, @kodster28, @pedrosousa, @haleycode, @GregBrimble, @KianNH, @WalshyDev
*.ts	@cloudflare/developer-advocacy, @kristianfreeman, @kodster28, @pedrosousa, @haleycode, @GregBrimble, @KianNH, @WalshyDev
/src/content/docs/style-guide/	@dcpena, @cloudflare/pcx-technical-writing

[github-actions]

Preview URL: https://cc97687d.preview.developers.cloudflare.com
Preview Branch URL: https://kian-pcx-18311.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/style-guide/components/render/	https://kian-pcx-18311.preview.developers.cloudflare.com/style-guide/components/render/