Doc: Use debug version of frameworks (DYLD_IMAGE_SUFFIX=_debug) option

Change-Id: I08dfb388a97953bf827d4b9f4355608278e3ea24
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

doc/src/projects/creator-projects-settings-run-desktop.qdocinc

@@ -10,6 +10,14 @@
 
     \image qtcreator-pprunsettings.png
 
+    The \gui {Use debug version of frameworks (DYLD_IMAGE_SUFFIX=_debug)} option
+    (available on Mac OS, only) enables you to debug (for example, step into)
+    linked frameworks, such as the Qt framework itself. You do not need this
+    option for debugging your application code. If you select this option, a
+    crash might occur when debugging applications on Mac OS X Snow Leopard. For
+    more information, see
+    \l{Application Crashes when Debugging on Mac OS X Snow Leopard}.
+
     You can also create custom executable run configurations where you
     can set the executable to be run. For more information, see
     \l{Specifying a Custom Executable to Run}.