Doc: Update URLs

Gitorious is closing down, so point to code.qt.io instead.

Change-Id: Ibc453f05e59cf227a7a7086201b008cf7b576a26
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>

doc/global/externalsites/qt-webpages.qdoc

@@ -49,11 +49,11 @@
     \title Qt Quarterly: Plural Form in Translation
 */
 /*!
-    \externalpage http://qt.gitorious.org
+    \externalpage https://code.qt.io/
     \title Public Qt Repository
 */
 /*!
-    \externalpage http://qt.gitorious.org/qt-labs/qtestlib-tools
+    \externalpage https://code.qt.io/cgit/%7bnon-gerrit%7d/qt-labs/qtestlib-tools.git/
     \title qtestlib-tools
 */