Fix font styles from 'italics' to 'italic'

[teinett]

Now:

styles: ["normal", "italics"],

Should be:

styles: ["normal", "italic"],

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Lunaria automatically ignores changes on specific PRs by adding a ignored keyword in its title. Found: typo.

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en/guides/fonts.mdx	Source changed, localizations will be marked as outdated.

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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.

[ArmandPhilippot]

Nice catch, thank you!

edit: I updated the title because of Lunaria, we want the change to be applied to translations too!