Add extra note to function clause pinning section (#1367)
Add extra note to function clause pinning section (#1367)

To show that the reassignment of the `greeting` variable is local to the
function and doesn't affect the outer scope.
psantos10/elixir-school,nscyclone/elixir-school,doomspork/elixir_school,doomspork/elixir_school,psantos10/elixir-school,nscyclone/elixir-school,doomspork/elixir-school,doomspork/elixir_school,doomspork/elixir-school,nscyclone/elixir-school,nscyclone/elixir-school,psantos10/elixir-school,doomspork/elixir-school