Doc: fix styling issues

Add missing \endlist and remove a \li to keep related information in the same list item.

Change-Id: I91f1d2d7915b915b67e4e038244e912789f37b24
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

doc/src/editors/creator-beautifier.qdoc

@@ -96,13 +96,15 @@
                 \li Select the \gui {Use self-defined style} option, and then
                     \gui Add to define your own style.
 
-                \li Define code formatting in the \gui {Edit Configuration}
+                    Define code formatting in the \gui {Edit Configuration}
                     dialog. It provides syntax highlighting, auto-completion,
                     and context-sensitive help. For these features, you must
                     have the tool installed.
 
                    \image beautifier_editor.png
 
+            \endlist
+
         \li Select \gui Tools > \gui Beautifier > \gui {Artistic Style},
             \gui ClangFormat, or \gui Uncrustify > \gui {Format Current File}
             to format the currently open file.