Minor: add a short explanation for "pipeline" in tutorial "Channel" chapter #823
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When I read the chapter Channel, I feel like beginners can be already overwhelmed by suddenly encountering so many new terms to some extent, and since the concept of pipelining comes from Redis, readers who aren’t familiar with Redis may find it even more confusing. That being said even if we provide a link to explain everything about pipeline, it’s necessary to include a brief explanation of pipelining directly in the article. So, a brief parenthetical explanation has been inserted immediately after the word pipeline.