add pod deletion advice

docs/upgrading.rst

@@ -22,6 +22,14 @@ flux suspend helmrelease nextcloud -n oas-apps
 flux resume helmrelease nextcloud -n oas-apps
 ```
 
+If aftewards your ``nc-nextcloud-xxxxxxxxxx-xxxxx`` pod is stuck in the
+``Initializing`` phase, you can delete it to make sure its replacement connects
+to the new databases:
+
+```
+kubectl delete pod -n oas-apps nc-nextcloud-xxxxxxxxxx-xxxxx
+```
+
 Upgrading to 0.7.0
 ------------------