Update Logger.metadata/1 documentation (#5158)
Update Logger.metadata/1 documentation (#5158)

Logger.metadata/1 recently got the ability to remove a key
gfvcastro/elixir,beedub/elixir,kelvinst/elixir,kimshrier/elixir,antipax/elixir,beedub/elixir,antipax/elixir,lexmag/elixir,elixir-lang/elixir,lexmag/elixir,pedrosnk/elixir,michalmuskala/elixir,pedrosnk/elixir,joshprice/elixir,kimshrier/elixir,gfvcastro/elixir,ggcampinho/elixir,ggcampinho/elixir,kelvinst/elixir