fix: remove image().refine from a code snippet in guides/images.mdx

[ArmandPhilippot]

Description (required)

Since v5, we cannot use refine() with the image() helper, so I updated an outdated example in guides/images.mdx.

I also slightly reworded the sentence above the code snippet because I believe this is no longer validated with Zod. But happy to revert or to reword if I'm wrong.

Related issues & labels (optional)

• Closes Using Zod's refine with image() for content collections #10151
• Suggested label: code snippet update

[astrobot-houston]

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[sarah11918]

Thank you for keeping us honest! 💪