Minor correction to URI.encode_query/1's doc block
Minor correction to URI.encode_query/1's doc block

Currently, the doc block states that "keys and values are URL encoded as
per `encode/2`" when they are actually encoded using
`encode_www_form/1`.

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