Added References to Operators (#7714)
Added References to Operators (#7714)

Added reference to operators like in https://github.com/smorin/elixir/edit/master/lib/elixir/pages/Guards.md

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