Doc: remove extra column from table on front page

Change-Id: I8ed573305d209f887a6e65623b5a40173493df73
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>

doc/src/qtcreator.qdoc

@@ -113,7 +113,6 @@
                     \li \l{Known Issues}
                     \li \l{Glossary}
                 \endlist
-            \li
         \row
             \li {4,1} \note To report bugs and suggestions to the Qt Bug
                 Tracker, select \uicontrol {Help > Report Bug}.