"Ban a user through the Admin Console or when deleting a comment. Do not enter the < or > symbols; these are only for reference purposes. Replace <community> and <user> with the username of the community and the username of the user, respectively."
However, the examples themselves don't have the angled brackets, e.g.
"ban_set: Ban a user from your community with the ban_set command:
ban_set user from community"
Minor difference, but potentially confusing. Checked the related FAQ for personal journals, and it doesn't have this problem.