Update Log.hx (#5371)

* Update Log.hx

Updated documentation. add types and remove awkward comment

* Update Log.hx

drop type

std/haxe/Log.hx

@@ -35,7 +35,9 @@ class Log {
 
 		This method can be rebound to a custom function:
 			var oldTrace = haxe.Log.trace; // store old function
-			haxe.Log.trace = function(v,infos) { // handle trace }
+			haxe.Log.trace = function(v, ?infos) { 
+			  // handle trace 
+			}
 			...
 			haxe.Log.trace = oldTrace;