anchor.diff:  `routing.router_groups.write` scopes.
   
   1. In a terminal window, run `cf curl /routing/v1/router_groups` to view the
  -`reservable_ports`:
  +`reservable_ports`. Record the `guid` from the output.<br>
  +For example:
     <pre class="terminal">
     $ cf curl /routing/v1/router\_groups
       [
  
positive.code:     ]
    </pre>
  
  1. Modify the `reservable_ports` as desired. To specify multiple ranges, the value may be a comma-separated list of single ports or ranges of ports, as shown below:
  
      <pre class="terminal">
      $ cf curl \
  
negative.code:     </pre>
  
  <p class="note">
  <strong>Note:</strong> Do not enter conflicting `reservable_ports` with other TCP router instances 
  or ephemeral port ranges. <%= vars.recommended_by %> recommends
  port ranges within `1024-2047` and `18000-32767` on default
  installations. Check what ports are
  available on the TCP Router VMs to verify that no additional ports
  are in use. For more information, see <a href="https://github.com/cloudfoundry/routing-release/issues/184">TCP router fails to configure routes when there is a port conflict with a local process</a> 
  in GitHub.
  </p>
  
  