Mention value types for individual options

Author: alco

lib/iex/lib/iex/options.ex

@@ -156,6 +156,8 @@ defmodule IEx.Options do
   This is an aggregate option that encapsulates all color settings used
   by the shell.
 
+  The value is a keyword list. List of supported keys:
+
     * enabled     -- boolean value that allows for switching the coloring
                      on and off
 
@@ -177,6 +179,8 @@ defmodule IEx.Options do
   used for printing results of expression evaluation. It is also used by
   IO.inspect.
 
+  The value is a keyword list.
+
   See the doc for `Kernel.inspect/2` for the full list of options.
 
   """