Improve description of what MM is
Improve description of what MM is

ferdinandrosario/concurrent-ruby,hobodave/concurrent-ruby,hobodave/concurrent-ruby,lucasallan/concurrent-ruby,hobodave/concurrent-ruby,lucasallan/concurrent-ruby,lucasallan/concurrent-ruby,lucasallan/concurrent-ruby,hobodave/concurrent-ruby,ferdinandrosario/concurrent-ruby,MadBomber/concurrent-ruby,ferdinandrosario/concurrent-ruby,ferdinandrosario/concurrent-ruby,MadBomber/concurrent-ruby,lucasallan/concurrent-ruby,MadBomber/concurrent-ruby,MadBomber/concurrent-ruby