Improve wording in Collectable doc (#9336)
Improve wording in Collectable doc (#9336)

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