[String] Previous versions are missing

[clement-michelet]

https://symfony.com/doc/current/string.html

Using https://symfony.com/doc/6.4/string.html lead to a 404
Workaround: Use the old URL https://symfony.com/doc/6.4/components/string.html (which is still accessible in the search)

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wouterj
e0dc6a2 this commit somehow made it into 6.4, triggering the redirect