Indicate more that review assignation will not delete already done reviews

doc/configure_instance.rst

@@ -396,7 +396,10 @@ Assign reviewers, again
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Link: https://strass-master.dev.pasteur.cloud/setup/review/overview/
 
-You can still assign and re-assign reviewers. A reviewer can be automatically unassigned if zhe was not manually assigned and have not started yet to provide a review
+.. note::
+    You can re-run reviewers assignation **without risk** of data loss.
+
+You can still assign and re-assign reviewers. A reviewer can be automatically unassigned only if zhe was not manually assigned and have not started yet to provide a review. Reviews that have been already started are kept.
 
 **Use case: new conflicts of interest**