Address review comments from @nilsding

Co-authored-by: Georg Gadinger <nilsding@nilsding.org>

app/models/user.rb

@@ -232,7 +232,7 @@ class User < ApplicationRecord
   end
 
   # Bans a user.
-  # @param duration [Fixnum, nil] Ban duration
+  # @param duration [Integer?] Ban duration
   # @param duration_unit [String, nil] Unit for the <code>duration</code> parameter. Accepted units: hours, days, weeks, months
   # @param reason [String] Reason for the ban. This is displayed to the user.
   # @param banned_by [User] User who instated the ban

spec/models/user_ban_spec.rb

@@ -1,5 +0,0 @@
-require 'rails_helper'
-
-RSpec.describe UserBan, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
-end