fix(Tooltip): allow for line break character

The line break character `\n` gets escaped in the inspector variable
and was not working as rich text. This fix ensures a line break can
be used correctly.

Assets/SteamVR_Unity_Toolkit/Scripts/VRTK_ObjectTooltip.cs

@@ -48,7 +48,7 @@ private void SetText(string name)
         {
             var tmpText = this.transform.FindChild("TooltipCanvas/" + name).GetComponent<Text>();
             tmpText.material = Resources.Load("UIText") as Material;
-            tmpText.text = displayText;
+            tmpText.text = displayText.Replace("\\n", "\n");
             tmpText.color = fontColor;
             tmpText.fontSize = fontSize;
         }