Update 'common.yml'

common.yml

@@ -173,6 +173,7 @@
         state: present
         reload: yes
         sysctl_file: /etc/sysctl.conf
+        #source: https://support.huaweicloud.com/intl/en-us/trouble-ecs/ecs_trouble_0324.html
 
     - name: Disable IPv6 with sysctl
       sysctl: name={{ item }} value=1 state=present reload=yes