Document URL sanitization for navigate() API

[delucis]

Description (required)

This PR documents sanitizing user input if passing it to the navigate() API exported from the astro:transitions module. This is the same advice as required when using user input with the web standard navigation.navigate() method.

Shout out to @zomaxsec for highlighting this!

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en/guides/view-transitions.mdx	Source changed, localizations will be marked as outdated.
en/reference/modules/astro-transitions.mdx	Source changed, localizations will be marked as outdated.

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]

Looks great! I did have a couple of suggestions for some more direct language for your consideration, but this looks like a wonderful docs addition! 🥳

[sarah11918]

I like your proposed suggestion, and LGTM! Thanks for making everyone safer, Chris!