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Clarify decode unicode behaviour in iter {content,lines} docstrings

Clarify decode unicode behaviour in iter {content,lines} docstrings: a task in requests-pr-diff (Harbor dataset). Title: Clarify decode unicode behaviour in iter {content,lines} docstrings

The task

**Title:** Clarify decode_unicode behaviour in iter_{content,lines} docstrings

Part of sergiopaniego/requests-pr-diff.