Doc: fix section name in the sidebar in online docs

"Debugging and Analyzing" is now "Testing", because
autotests are also described in this section.

Change-Id: Ied1de78d630e4e7faa39d343475b5e493b5e89c7
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>

doc/config/style/qt5-sidebar.html

@@ -10,7 +10,7 @@
             <li><a href="creator-design-mode.html">Designing User Interfaces</a></li>
             <li><a href="creator-coding.html">Coding</a></li>
             <li><a href="creator-building-running.html">Building and Running</a></li>
-            <li><a href="creator-testing.html">Debugging and Analyzing</a></li>
+            <li><a href="creator-testing.html">Testing</a></li>
             <li><a href="creator-advanced.html">Advanced Use</a></li>
             <li><a href="creator-help-overview.html">Getting Help</a></li>
         </ul>