Fix minor typos in the "Matching generally static values" FAQ example

[jmargeta]

This fixes the example by using <Lang lang="…"/> instead of <Lang code="…"/> (to respect Lang's signature) and by setting the language codes to correspond with the paths.

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[remix-cla-bot]

Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳

[timdorr]

Thanks!