Doc: Fix the broken link to the Qt for Device Creation docs

Task-number: QTBUG-70899
Change-Id: I070d4b0e9e6ca63be0dd7a17186bff6dee65e089
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>

doc/src/external-resources.qdoc

@@ -303,6 +303,10 @@
     \externalpage https://doc.qt.io/QtForDeviceCreation/qt-configuration-tool.html
     \title Qt Configuration Tool
 */
+/*!
+    \externalpage https://doc.qt.io/QtForDeviceCreation/qtdc-supported-platforms.html
+    \title Qt for Device Creation: Supported Target Devices and Development Hosts
+*/
 
 /*!
     \externalpage https://qmlbook.github.io/

doc/src/platforms/supported-platforms.qdoc

@@ -65,8 +65,8 @@
     In the above table, the configurations in \b bold are \e {reference
     configurations}.
 
-    \b {See also}: \l {http://doc.qt.io/QtForDeviceCreation/qtee-supported-platforms.html}
-                      {Qt for Device Creation: Supported Target Devices and Development Hosts}.
+    \b{See also}:
+    \l{Qt for Device Creation: Supported Target Devices and Development Hosts}.
 
     \section2 Reference Configurations