Improve the docs for non temporary restart in Task.Supervisor
Improve the docs for non temporary restart in Task.Supervisor

Closes #6247

michalmuskala/elixir,antipax/elixir,joshprice/elixir,lexmag/elixir,ggcampinho/elixir,kimshrier/elixir,pedrosnk/elixir,antipax/elixir,elixir-lang/elixir,kelvinst/elixir,beedub/elixir,beedub/elixir,gfvcastro/elixir,pedrosnk/elixir,lexmag/elixir,gfvcastro/elixir,kelvinst/elixir,kimshrier/elixir,ggcampinho/elixir