docs(IGLogSystem): Mention encoding in the doc

Author: jcs090218

docs/ScriptReference/UI/InGameLogSystem/JCS_IGLogSystem.md

@@ -16,3 +16,14 @@ In game log system.
 | SendLogMessages     | Make multiple log messages on the screen.        |
 | RemoveFromRenderVec | Remove the log message that are outdated.        |
 | UpdateSpace         | Update all current active log messages' spacing. |
+
+## Support Encodings
+
+If you try to display a message but it displays `?` question mark instead.
+
+```cs
+var igl = JCS_UtilitiesManager.instance.GetIGLogSystem();
+igl.SendLogMessage("Unicode text here!");
+```
+
+Make sure you have save your C# script in the correct file encoding.