Update is_vpc.html.markdown

website/docs/r/is_vpc.html.markdown

@@ -96,11 +96,20 @@ Review the argument references that you can specify for your resource.
   - `enable_hub` - (Optional, Boolean) Indicates whether this VPC is enabled as a DNS name resolution hub.
   - `resolver` - (Optional, List) The zone list this backup policy plan will create snapshot clones in.
     Nested scheme for `resolver`:
-      - `manual_servers` - (Optional, List) The DNS servers to use for this VPC, replacing any existing servers. All the DNS servers must either: **have a unique zone_affinity**, or **not have a zone_affinity**.
 
         ~> **Note:** 
           `manual_servers` must be set if and only if `dns.resolver.type` is manual.
-
+      - `manual_servers` - (Optional, List) The DNS servers to use for this VPC, replacing any existing servers. All the DNS servers must either: **have a unique zone_affinity**, or **not have a zone_affinity**.
+
+          Nested schema for **manual_servers**:
+
+          - `address` - (Required, String) The IP address. This property may add support for IPv6 addresses in the future. When processing a value in this property, verify that the address is in an expected format. If it is not, log an error. Optionally halt processing and surface the error, or bypass the resource on which the unexpected IP address format was encountered.
+          - `zone_affinity` - (Optional, List) If present, DHCP configuration for this zone will have this DNS server listed first.
+
+        ~> **Note:** 
+          While using `zone_affinity`, if fewer DNS servers are specified than the number of zones, then default servers will be created and terraform would show change. Its advised to provide `address` for all `zone_affinity`.
+
+
       - `type` - (Optional, String) The type of the DNS resolver to use.
 
         ~> **Note:**