Update getting-started.md

minor fix on call `gyroscope.toString` this is a function : `gyroscope.toString()`

Author: alv67

content/hardware/05.nicla/boards/nicla-sense-me/tutorials/getting-started/getting-started.md

@@ -105,7 +105,7 @@ The **Arduino_BHY2** library contains these sensors:
     valueY = gyroscope.y();
     valueZ = gyroscope.z();
 
-    Serial.println(gyroscope.toString); //Prints all the data "automatically"
+    Serial.println(gyroscope.toString()); //Prints all the data "automatically"
 
     //Print the individual values
     Serial.println(valueX);