Update miflora docs: fix minor syntax errors (#1717)

source/_components/sensor.miflora.markdown

@@ -19,9 +19,9 @@ To use your Mi Flora plant sensor in your installation, add the following to you
 
 ```yaml
 # Example configuration.yaml entry
-sensor
+sensor:
   - platform: miflora
-    mac: xx:xx:xx:xx:xx:xx
+    mac: "xx:xx:xx:xx:xx:xx"
     monitored_conditions:
       - temperature
 ```
@@ -47,9 +47,9 @@ A full configuration example could looks the one below:
 
 ```yaml
 # Example configuration.yaml entry
-sensor
+sensor:
   - platform: miflora
-    mac: xx:xx:xx:xx:xx:xx
+    mac: "xx:xx:xx:xx:xx:xx"
     name: Flower 1
     force_update: false
     median: 3