Fix: small doc error (#428)

Remove duplicate word in network_peering documentation

Author: lescactus

website/docs/r/network_peering.html.markdown

@@ -381,7 +381,7 @@ In addition to all arguments above, the following attributes are exported:
 
 ## Import
 
-Clusters can be imported using project ID and network peering peering id, in the format `PROJECTID-PEERID-PROVIDERNAME`, e.g.
+Clusters can be imported using project ID and network peering id, in the format `PROJECTID-PEERID-PROVIDERNAME`, e.g.
 
 ```
 $ terraform import mongodbatlas_network_peering.my_peering 1112222b3bf99403840e8934-5cbf563d87d9d67253be590a-AWS