docs(deps): add step in rel. notes for Payara update IQSS#8947

As documented by @qqmyers in IQSS#8230 one needs to remove the
`lib/databases` folder from the domain dir on update to
a Payara version beyond 5.2021.8.

doc/release-notes/8947-payara-update.md

@@ -40,8 +40,12 @@ export PAYARA=/usr/local/payara5
 ```shell
     service payara stop
     rm -rf $PAYARA/glassfish/domains/domain1/generated
+    rm -rf $PAYARA/glassfish/domains/domain1/osgi-cache
+    rm -rf $PAYARA/glassfish/domains/domain1/lib/databases
 ```
 
+(The deletion of `lib/databases` and root cause has been documented in #8230 by @qqmyers)
+
 3. Move the current Payara directory out of the way
 
 ```shell
@@ -69,4 +73,4 @@ export PAYARA=/usr/local/payara5
 ```shell
     service payara stop
     service payara start
-```
+```