Documentation https://www.postgresql.org/docs/13/runtime-config-client.html
<https://www.postgresql.org/docs/13/runtime-config-client.html>
shows that `idle_in_transaction_session_timeout` is integer, bug you can
set text values '30s' and `show idle_in_transaction_session_timeout`
returns `30s` not an integer.
Documentation should be updated to include this data field format.