Fixed the rename command. (#1260)

Fixed the rename command.

Author: emohandesi

src/shadowbox/README.md

@@ -119,7 +119,7 @@ Rename an access key
 (e.g. rename access key 2 to 'albion')
 
 ```
-curl --insecure -X PUT curl -F 'name=albion' $API_URL/access-keys/2/name
+curl --insecure -X PUT -F 'name=albion' $API_URL/access-keys/2/name
 ```
 
 Remove an access key