mention async & .ExecutableScript

Docs/Scripting.md

@@ -54,4 +54,6 @@ An example use of `LoadedLuaScript`:
 		var loaded = prepared.Load(server);
 		loaded.Evaluate(db, new { key = (RedisKey)"mykey", value = 123 });
 	}
-```
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+```
+
+All methods on both `LuaScript` and `LoadedLuaScript` have Async alternatives, and expose the actual script submitted to redis as the `ExecutableScript` property.
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