Doc: Update links to forum.qt.io

Change-Id: I10c1fd388b44c45412fad544604e51fbd2807f96
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>

doc/global/html-footer-online.qdocconf

@@ -37,7 +37,7 @@ HTML.footer += \
     "    <li id=\"menu-item-1364\" class=\"menu-item menu-item-type-custom menu-item-object-custom menu-item-1364\"><a href=\"http://doc.qt.io/qt-5/qtexamplesandtutorials.html\">Examples &amp; Tutorials</a></li>\n" \
     "    <li id=\"menu-item-1363\" class=\"menu-item menu-item-type-custom menu-item-object-custom menu-item-1363\"><a href=\"http://doc.qt.io/qt-5/topics-app-development.html\">Tools</a></li>\n" \
     "    <li id=\"menu-item-1361\" class=\"menu-item menu-item-type-custom menu-item-object-custom menu-item-1361\"><a href=\"http://wiki.qt.io/\">Wiki</a></li>\n" \
-    "    <li id=\"menu-item-1360\" class=\"menu-item menu-item-type-custom menu-item-object-custom menu-item-1360\"><a href=\"http://qt-project.org/forums\">Forums</a></li>\n" \
+    "    <li id=\"menu-item-1360\" class=\"menu-item menu-item-type-custom menu-item-object-custom menu-item-1360\"><a href=\"http://forum.qt.io/\">Forums</a></li>\n" \
     "    <li id=\"menu-item-1362\" class=\"menu-item menu-item-type-custom menu-item-object-custom menu-item-1362\"><a href=\"http://wiki.qt.io/Qt_Contribution_Guidelines\">Contribute to Qt</a></li>\n" \
     "</ul>\n" \
     "</li>\n" \

doc/global/html-header-online.qdocconf

@@ -121,7 +121,7 @@ HTML.postheader = \
     "    <ul class=\"sub-navigation\">\n" \
     "        <li><a href=\"http://wiki.qt.io/\">Wiki</a></li>\n" \
     "        <li><a href=\"http://doc.qt.io/\" class=\"active\">Documentation</a></li>\n" \
-    "        <li><a href=\"http://qt-project.org/forums\">Forum</a></li>\n" \
+    "        <li><a href=\"http://forum.qt.io/\">Forum</a></li>\n" \
     "        <li><a href=\"https://bugreports.qt.io/\">Bug Reports</a></li>\n" \
     "        <li><a href=\"https://codereview.qt-project.org/\">Code Review</a></li>\n" \
     "    </ul>\n" \