Reword docs about Collectable.into/1 (#8775)
Reword docs about Collectable.into/1 (#8775)

Be explicit that we are talking about Collectable.into/1
and Enumerable.reduce/3

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