The note.yml file, in the starter kit has a helpline for the gallery field. The help field currently doesn’t show the name of the {{ gallery }} tag because of the curly brackets. The first two curly brackets before gallery should be preceded by a backslash in order for it to become visible.
help: Place the \{\{ gallery }} tag anywhere in your text to add the selected gallery
I discovered I could create a pull request, so I changed it in Github.