Tune edoc options

Improved the readability of long parameter lists.

rebar.config

@@ -41,5 +41,7 @@
 
 
 {edoc_opts, [
-    {preprocess, true}, {stylesheet, "style.css"}
+    {preprocess, true}, 
+	{stylesheet, "style.css"},
+	{pretty_printer,  erl_pp}
 ]}.