Correcting from comments

Signed-off-by: Damien Thenot <[email protected]>

Author: Nambrok

docs/troubleshooting/common-problems.md

@@ -272,20 +272,20 @@ Remove `/var/lib/xcp-ng-xapi-plugins/updater.py.lock` and that should fix it.
 
 ---
 
-## Unable to live migrate VDI disks between SRs
+## Unable to live migrate VDI between SRs
 
 ### Cause
 
-The upgrade from 8.2 to 8.3 can cause an issue where `/etc/stunnel/xapi-pool-ca-bundle.pem` can be empty.
+Upgrading from 8.2 to 8.3 can cause an issue where `/etc/stunnel/xapi-pool-ca-bundle.pem` can be empty or missing
 You can check this with `du /etc/stunnel/xapi-pool-ca-bundle.pem` on the host.
-It will cause problems with live migrating VDI between SRs (with the VM staying on the same host) where the migration fails with:
+It will cause problems with live migrating VDI between SRs (even if the VM remains on the same host) where the migration fails with:
 ```
 Xenops_interface.Xenopsd_error([S(Internal_error);S(Sys_error(\"Connection reset by peer\"))])
 ```
 
 ### Solution
 
-The solution is to run this command to create the file:
+To fix, this, run this command to create the file:
 ```
 xe host-refresh-server-certificate host=<host name>
 ```
@@ -295,4 +295,6 @@ You can run this command to execute it on all the host of the pool:
 xe host-list --minimal | tr "," "\n" | xargs -I _ xe host-param-get uuid=_ param-name=name-label | xargs -I _ xe host-refresh-server-certificate host=_
 ```
 
+To know more about certificates in XAPI, you can read in the [XAPI doc](https://xapi-project.github.io/new-docs/design/pool-certificates/index.html)
+
 ---