Update priority prop reference

[ascorbic]

Description (required)

Since 5.10, priority has been allowed on all images, not just responsive ones. This PR removes the duplicated prop from the responsive section, fixes the heading level, and clarifies some of the wording

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For Astro version: 5.12.1. See astro PR #14094.

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Warnings reference

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[sarah11918]

This all looks good, @ascorbic ! Just added merge on release since this has to wait for the corresponding PR to be released! 🙌

[ascorbic]

This doesn't need to wait - it already worked, the types were just wrong