Add a note to the docs for Enum.reduce/2
Add a note to the docs for Enum.reduce/2

I added a note that clarifies that Enum.reduce/2 calls the reducer
function n - 1 times where n is the length of the enumerable.

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