fix doc page title

platform/ui/src/views/ToolbarSecondary/ToolbarSecondary.mdx

@@ -9,7 +9,7 @@ import { Playground } from 'docz';
 import classnames from 'classnames';
 import { Icon, IconButton } from '@ohif/ui';
 
-# Toolbar Header
+# Toolbar Secondary
 
 This example shows you how you can build a Toolbar using the available
 components.