On this page:
https://manual.audacityteam.org/man/record.html
Regarding item #3:
“Singing or playing the loudest part of what you are recording, adjust the recording level using the right-hand slider on Mixer Toolbar:
https://manual.audacityteam.org/m/images/2/2b/mixertoolbarwithoutinputselect.png
so that the moving Meter Toolbar bars do not get too close to the right-hand edge of the meter.”
.,…shouldn’t it be the LEFT-hand slider?
Yes it should. Thanks for the report.
Unfortunately it’s probably too late for the next Audacity release as the manual was packaged for distribution a couple of days ago, but I’ll add a note for it to be fixed asap.
Great catch dannyboy2, many thanks for reporting that 
I have made this change - it will not make it into the upcoming 2.3.3 mANUAL unless we need RC04 or greater - we are working with Release Candidate RC03 right now and as Steve says the Manual has already been pulled for that.
Peter.
Happy to help!