[PR #13222/62aa4272 backport][8.3.x] doc: Clarify capturing .readouterr() return value #13225
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This is a backport of PR #13222 as merged into main (62aa427).
This got added in 38fb6aa, where the "The return value ... changed" made a lot of sense. However, 9c5da9c removed the "versionadded" without adjusting the wording.
Also see 3a4435f.