Update platform feature table for QtBluetooth

Added Android Peripheral and WinRT Classic Bluetooth.

Change-Id: I2c1d55553d3940eeb050d38ebf817a61620dafe7
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

src/bluetooth/doc/src/bluetooth-index.qdoc

@@ -50,7 +50,7 @@ Currently, the API is supported on the following platforms:
     \li x
     \li x
     \li x
-    \li
+    \li x
     \li
 \row
     \li Bluetooth LE Central
@@ -62,7 +62,7 @@ Currently, the API is supported on the following platforms:
     \li
 \row
     \li Bluetooth LE Peripheral
-    \li
+    \li x
     \li x
     \li x
     \li x