I started working through a tutorial linked from the home page for the online manual for Audacity 2.2.2.
The instructions for contracting a selection instructed to use shift-ctrl with the left and right arrows. There was no additional instructions to use cmd instead of ctrl on MacOS. I figured it out by trial and error.
Should I report this as a documentation error or something? Where are issues with the documentation reported?
Here is fine - I do most of the editing of the Manual these days
Which page or pages are you referring to - can you post a link or links please ? BTW I can only make corrections for the Manual for the next release (the upcoming 2.3.0) - once a release is made the Manual for that version is frozen and cannot be changed.