Update index.properties

Author: janfaracik

src/main/resources/io/jenkins/plugins/designlibrary/AppBar/index.properties

@@ -1,6 +1,6 @@
 topAppBar=Top app bar
 topAppBar.description=Top app bar provides the page heading as well as important actions.
-topAppBar.do.1=Use an app bar over a <code>h1</code> element as app bars have unique properties.
+topAppBar.do.1=Use an app bar instead of a <code>h1</code> element as app bars have unique properties.
 topAppBar.do.2=Place your most important actions in the app bar.
 topAppBar.do.3=Show a count subtitle if it explicitly relates to your page.
 topAppBar.dont.1=Avoid showing more than four actions at once, relegate less used actions to an overflow menu.