Update documentation and examples.

docs/examples/multiple_files/devices.yml

@@ -1,8 +1,18 @@
 devices:
-  - name: main
+  - name: primary
     type: virtual
-    buttons: 56
-    axes: 8
+    num_buttons: 74
+    num_axes: 8
+  - name: secondary
+    type: virtual
+    num_buttons: 74
+    num_axes: 2
+  - name: mouse
+    type: virtual
+    num_buttons: 0
+    num_axes: 0
+    rel_axes:
+      - REL_WHEEL
   - name: right-stick
     type: physical
     device_name: VIRPIL Controls 20220407 R-VPC Stick MT-50CM2
@@ -14,4 +24,4 @@ devices:
     device_name: "CH PRODUCTS CH PRO PEDALS USB "
   - name: button-box
     type: physical
-    device_name: Arduino Arduino Joystick
+    device_name: Arduino Arduino Joystick