fix typo: exmaple -> example (#982)
fix typo: exmaple -> example (#982)


doomspork/elixir_school,nscyclone/elixir-school,psantos10/elixir-school,doomspork/elixir_school,erickgnavar/elixir-school,doomspork/elixir-school,doomspork/elixir-school,nscyclone/elixir-school,erickgnavar/elixir-school,nscyclone/elixir-school,doomspork/elixir_school,nscyclone/elixir-school,doomspork/elixir-school,erickgnavar/elixir-school,psantos10/elixir-school,psantos10/elixir-school