DC - Removed tabs from example YAML file

Section2/simple_YAML/list_of_dictionaries.yaml

 vlans:
   - Management:
-    vlan_id:		99
-    description:	‘Management OOB’
-    ipv4_subnets:	193.1.219.0/24
+    vlan_id:        99
+    description:    ‘Management OOB’
+    ipv4_subnets:   193.1.219.0/24
   - DNS_AUTH:
-    vlan_id:		10
-    description:	‘Authoritative DNS servers’
-    ipv4_subnets:	193.1.220.0/26
+    vlan_id:        10
+    description:    ‘Authoritative DNS servers’
+    ipv4_subnets:   193.1.220.0/26
     dhcp_servers:
       - 193.1.2.1
       - 193.1.3.1