Not sure if this is the right place to report a typo in Sonic Pi Help, but here it is in the topic title for “buffer”:
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Here is probably fine (at least Sam noticed it), but another good place is on the github repo where you can directly open a pull request with the fix - and get your name in the contributor list 
!
Even if you’re not familiar with the code layout, searching for the misspelled word leads directly to here, and for a small change like this it’s easy to edit the file and open a PR online without even needing to clone the repo locally.
Yes, thank you! I realized that as soon as I posted it. Will do.
LOL. How have I not noticed this before?? 
Good spotting! 