Fix version

Author: nvazquez

source/plugins/netris-plugin.rst

@@ -1,7 +1,6 @@
 .. Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
-   distributed with this work for additional information#
-   regarding copyright ownership.  The ASF licenses this file
+   distributed with this work for additional information   regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
    with the License.  You may obtain a copy of the License at
@@ -38,7 +37,7 @@ Supported Versions
 +--------------+----------------------+----------------+
 | Hypervisor   | CloudStack Version   | Netris Version |
 +==============+======================+================+
-| KVM          | >= 4.20              | 4.4.0          |
+| KVM          | >= 4.21              | 4.4.0          |
 +--------------+----------------------+----------------+
 
 Table: Supported Versions