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If you want PRs, I suggest you set up Semantic Linefeeds* sooner, rather than later. Each sentence gets its own line, and it really helps avoid merge conflicts.

* https://rhodesmill.org/brandon/2012/one-sentence-per-line/

TIL. It's too late for this book, but I'll try it in the next one.
You have a line per paragraph now, so a quick and dirty version is to add newlines after "[.!?] ", though code blocks might take some fiddling.