QLowEnergyController: Fix spelling error

Change-Id: I5f3e3e415730e36647ec0011c9fe0ed350d4cd62
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

src/bluetooth/qlowenergycontroller_android.cpp

@@ -848,7 +848,7 @@ void QLowEnergyControllerPrivate::advertisementError(int errorCode)
         errorString = QLowEnergyController::tr("Failed due to too many advertisers");
         break;
     default:
-        errorString = QLowEnergyController::tr("Unknown advertisment error");
+        errorString = QLowEnergyController::tr("Unknown advertisement error");
         break;
     }