Update sensor.serial.markdown (home-assistant#3937)

travislreno · fabaff · commit 264ea2982b73 · 2017-11-09T07:40:38.000+01:00
diff --git a/source/_components/sensor.serial.markdown b/source/_components/sensor.serial.markdown
@@ -27,11 +27,11 @@ To setup a serial sensor to your installation, add the following to your `config
 # Example configuration.yaml entry
 sensor:
   - platform: serial
-    port: /dev/ttyACM0
+    serial_port: /dev/ttyACM0
 ```
 
 {% configuration %}
-  port:
+  serial_port:
     description: Local serial port where the sensor is connected and access is granted.
     required: true
     type: string
