Update Ruby documentation (3.1.1)

assets/javascripts/templates/pages/about_tmpl.coffee

@@ -779,7 +779,7 @@ credits = [
     'https://raw.githubusercontent.com/rethinkdb/docs/master/LICENSE'
   ], [
     'Ruby',
-    '1993-2017 Yukihiro Matsumoto',
+    '1993-2022 Yukihiro Matsumoto',
     'Ruby',
     'https://www.ruby-lang.org/en/about/license.txt'
   ], [

lib/docs/scrapers/rdoc/ruby.rb

@@ -63,12 +63,16 @@ module Docs
       /\AXMP/]
 
     options[:attribution] = <<-HTML
-      Ruby Core &copy; 1993&ndash;2020 Yukihiro Matsumoto<br>
+      Ruby Core &copy; 1993&ndash;2022 Yukihiro Matsumoto<br>
       Licensed under the Ruby License.<br>
       Ruby Standard Library &copy; contributors<br>
       Licensed under their own licenses.
     HTML
 
+    version '3.1' do
+      self.release = '3.1.1'
+    end
+
     version '3' do
       self.release = '3.0.0'
     end