[8.9] [DOCS] document `Content-Type` breaking change from 8.0 (#116845)#117063

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shainaraskas merged 1 commit intoelastic:8.9from shainaraskas:backport/8.9/pr-116845

Nov 19, 2024

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Commits on Nov 19, 2024

[DOCS] document Content-Type breaking change from 8.0 (elastic#116845 )
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