More clearly specify the Linux and Bluez version for BTLE support

Change-Id: If62bce8794855b8865e02ed87ec3faac80bfc3bd
Reviewed-by: Timur Pocheptsov <Timur.Pocheptsov@digia.com>
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>

src/bluetooth/doc/src/bluetooth-le-overview.qdoc

@@ -172,8 +172,7 @@ Low Energy devices.
     \l {heartlistener}{Heart Listener} example.
 
     \note As of Qt 5.4 the Qt Bluetooth Low Energy API is in tech preview mode and supports Linux
-    with BlueZ 4 & 5. Only the last versions of Bluez 4.x (v 4.101 confirmed to work) and Linux kernels
-    from version 3.5 onwards support this feature.
+    with BlueZ 4.101 & 5.x. The minimal Linux kernel version is 3.5.
 
     \section2 Establishing a Connection