Fix typo

Change-Id: I0bbe9da97de8a71824888ee0d4387aaa338e40a0
Reviewed-on: https://gerrit.libreoffice.org/66645
Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

chart2/source/controller/inc/ChartToolbarController.hxx

@@ -39,7 +39,7 @@ public:
     ChartToolbarController(const ChartToolbarController&) = delete;
     const ChartToolbarController& operator=(const ChartToolbarController&) = delete;
 
-    // XToolbarContoller
+    // XToolbarController
     virtual void SAL_CALL execute(sal_Int16 nKeyModifier) override;
 
     virtual void SAL_CALL click() override;