Fix license headers in example

It's a part of QtAndroidExtras not QtWinExtras.

Change-Id: I095d39e69dcd1c5362aa50a9e71a29e024fdab38
Reviewed-by: Christian Stromme <christian.stromme@digia.com>
Add examplesinstallpath in qdocconf

If we don't add examplesinstallpath the examples won't be shown in
Qt Creator's welcome page.

Change-Id: Ia1c0015262e4dd3c6de83d7d73231e3e3e0cf027
Reviewed-by: Paul Olav Tvete <paul.tvete@digia.com>