Fix whitespace for GenServer.whereis/1
Fix whitespace for GenServer.whereis/1

Try to make consistent with rest of file.

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