Merge branch 'feature/cinder_warning' into 'master'

change notice to warning

See merge request cloud/documentation!14

cli/README.md

@@ -30,8 +30,8 @@ it is a form of token-based authentication providing easy and secure access with
    [configure](https://docs.openstack.org/python-openstackclient/rocky/configuration/index.html)
    OpenStack CLI client.
 
-   <div style="border-width:0;border-left:5px solid #b8d6f4;background-color:rgba(228,240,251,0.3);margin:20px 0;padding:10px 20px;font-size:15px;">
-     <strong>Notice:</strong><br/><br/>
+   <div style="border-width:0;border-left:5px solid #b8d6f4;background-color:rgba(255,0,0,0.3);margin:20px 0;padding:10px 20px;font-size:15px;">
+     <strong>WARNING:</strong><br/><br/>
      Add the following line to the <strong>openrc</strong> file:<br/>
      <strong>export OS_VOLUME_API_VERSION=3</strong>
      <br/><br/>