Align singular/plural use in Update services.yaml

Author: dlein

custom_components/spook/services.yaml

@@ -214,7 +214,7 @@ homeassistant_disable_device:
   fields:
     device_id:
       name: Device
-      description: The device/devices to disable.
+      description: The device(s) to disable.
       required: true
       selector:
         device:
@@ -227,7 +227,7 @@ homeassistant_enable_device:
   fields:
     device_id:
       name: Device
-      description: The device/devices to enable.
+      description: The device(s) to enable.
       required: true
       selector:
         device: