Update security.md

Author: Mpdreamz

docs/contents/elasticsearch-net/security.md

@@ -8,7 +8,7 @@ menuitem: esnet-security
 # Security
 
 
-## Authorization
+## Authentication
 
 NEST and Elasticsearch.NET support basic auth out of the box by setting your credentials on `ConnectionSettings`
 
@@ -128,4 +128,4 @@ Given your application has access to your CA public key:
 		_knownPrints.AddOrUpdate(certificateHash, isValid, (s, b) => isValid);
 		return isValid;
 
-	};
+	};