Merge pull request #433 from janfaracik/app-bar

Update 'App bar' guidance

Author: krisstern

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

@@ -28,6 +28,9 @@
           <td>${%topAppBar.do.2}</td>
           <td>${%topAppBar.dont.2}</td>
         </tr>
+        <tr>
+          <td>${%topAppBar.do.3}</td>
+        </tr>
       </s:dos-donts>
     </s:section>
 

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

@@ -1,7 +1,8 @@
 topAppBar=Top app bar
 topAppBar.description=Top app bar provides the page heading as well as important actions.
-topAppBar.do.1=Place your most important actions in the top app bar.
-topAppBar.do.2=Show a count subtitle if it explicitly relates to your page.
+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.
 topAppBar.dont.2=Avoid showing a count subtitle if it could relate to multiple things on your page.