String.to_float/1 docs updated

Author: José Valim

lib/elixir/lib/string.ex

@@ -888,9 +888,8 @@ defmodule String do
 
   @doc """
   Converts a string to a float. If successful, returns a
-  tuple of the form `{float, remainder of string}`. If unsuccessful,
-  returns `:error`. If given an integer value, will return
-  the same value as `to_integer/1`.
+  tuple of the form `{float, remainder of string}`.
+  If unsuccessful, returns `:error`.
 
   ## Examples