[PR #7283/0e7c272f backport][3.9] Add note about updating headers in on_response_prepare #7294
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This is a backport of PR #7283 as merged into master (0e7c272).
Fixes #6443.
It seems like it'll be easier just to document this. Only solution that looks like it'd work is to update the Content-Length header every time the body is changed, but that could incur a performance penalty for little reason.