Fix typo in pt/lessons/advanced/otp-supervisors.md (#1949)
Fix typo in pt/lessons/advanced/otp-supervisors.md (#1949)


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