Fix Codeblocks in Images documentation

[dochne]

Summary

Codeblocks in the codebase work like this:

console.log("my code here");

In certain circumstances, prettier tries to push this into one line:
js console.log("my code here");

This isn't supported and leads to incorrect looking output:

This PR fixes a couple of files that were inadvertently broken and adds them to the .prettierignore list so that it doesn't automatically break again.

Documentation checklist

• The documentation style guide has been adhered to.

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PR Change Summary

Fixed issues with codeblocks in Images documentation to prevent formatting errors caused by Prettier.

• Corrected codeblock formatting in multiple documentation files
• Added affected files to .prettierignore to prevent future formatting issues
• Ensured adherence to the documentation style guide

Modified Files

• src/content/partials/images/metadata.mdx
• src/content/partials/images/onerror.mdx
• src/content/partials/images/slow-connection-quality.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
*	@cloudflare/pcx-technical-writing

[github-actions]

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