Update hddtemp.rst

docs/aoa/hddtemp.rst

@@ -16,7 +16,9 @@ For example on a CentOS/Redhat Linux operating system, you have to:
 
 ```
 sudo yum install hddtemp
+
 sudo systemctl enable hddtemp
+
 sudo systemctl enable hddtemp
 ```
 
@@ -24,7 +26,9 @@ Test it in the console:
 
 ```
 $ hddtemp
+
 /dev/sda: TOSHIBA MQ01ACF050: 41°C
+
 /dev/sdb: ST1000LM044 HN-M101SAD: 38°C
 ```