docs: fix the code snippets in the JSDoc for the configuration options (#17699)

Author: ArmandPhilippot

.changeset/hungry-rockets-nail.md

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+---
+'astro': patch
+---
+
+Fixes several documentation issues related to the JSDoc for configuration options.
+
+- When hovering over the `server` and `fonts` options, the JSDoc for the nested options was displayed instead of the JSDoc for the top-level property.
+- Two i18n configuration options were being used incorrectly in the examples.
+- The indentation of some code blocks was broken on hover.