Doc: Clean up links to previous pages

Change-Id: I4352760bfce5637905c432a90f77242d4ad4a668
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

doc/src/cmake/creator-projects-cmake.qdoc

@@ -31,7 +31,7 @@
 
 /*!
     \contentspage {Qt Creator Manual}
-    \previouspage creator-building-targets.html
+    \previouspage creator-project-other.html
     \page creator-project-cmake.html
     \nextpage creator-project-qbs.html
 

doc/src/projects/creator-projects-settings-overview.qdoc

 /****************************************************************************
 **
-** Copyright (C) 2016 The Qt Company Ltd.
+** Copyright (C) 2017 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Creator documentation.
@@ -31,7 +31,7 @@
 
 /*!
     \contentspage {Qt Creator Manual}
-    \previouspage creator-version-control.html
+    \previouspage creator-vcs-subversion.html
     \page creator-configuring-projects.html
     \nextpage creator-targets.html