Doc: Remove instructions for using qtdemo from examples README

The Qt Examples and Demos Launcher is not maintained anymore. Edit the
README to mention Qt Creator as the way to find and launch examples.

Task-number: QTBUG-28388

Change-Id: If3662d53a46335a5bdd8ced2df104e545d3fe5ba
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

examples/xmlpatterns/README

@@ -3,36 +3,7 @@ Qt XML Patterns module.
 
 XQuery is a query language used to query XML in a concise and safe manner.
 
-The example launcher provided with Qt can be used to explore each of the
-examples in this directory.
+Documentation for these examples can be found via the Examples and Tutorials
+link in the main Qt documentation. The examples and their documentation can
+also be opened from the Examples tab of Qt Creator's Welcome mode.
 
-Documentation for these examples can be found via the Tutorial and Examples
-link in the main Qt documentation.
-
-
-Finding the Qt Examples and Demos launcher
-==========================================
-
-On Windows:
-
-The launcher can be accessed via the Windows Start menu. Select the menu
-entry entitled "Qt Examples and Demos" entry in the submenu containing
-the Qt tools.
-
-On Mac OS X:
-
-For the binary distribution, the qtdemo executable is installed in the
-/Developer/Applications/Qt directory. For the source distribution, it is
-installed alongside the other Qt tools on the path specified when Qt is
-configured.
-
-On Unix/Linux:
-
-The qtdemo executable is installed alongside the other Qt tools on the path
-specified when Qt is configured.
-
-On all platforms:
-
-The source code for the launcher can be found in the demos/qtdemo directory
-in the Qt package. This example is built at the same time as the Qt libraries,
-tools, examples, and demonstrations.