[TYPO3-doc] formal or informal in official docs

[Xavier Perseguers]

> I can't say for other languages, but I would find it weird in French to
> have a manual address me in an informal way. So I would go for formal.

And in docs/manuals, for sure, as said by Francois, in French you just
cannot use an informal way.

-- 
Xavier Perseguers
TYPO3 CMS Team Member

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