minor #20563 Remove build spelling world list (alamirault)

This PR was merged into the 6.4 branch.

Discussion
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Remove build spelling world list

Maybe I'm wrong but I think this file was used with sphinx and python build (introduced in https://github.com/symfony/symfony-docs/pull/12837/files)

CI is green so it's ok ?

Commits
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d32dd55 Remove build spelling world list