Fix codeblock

src/current/advisories/a104309.md

@@ -15,7 +15,7 @@ Publication date: {{ page.advisory_date | date: "%B %e, %Y" }}
 A [rangefeed](https://www.cockroachlabs.com/docs/stable/create-and-configure-changefeeds#enable-rangefeeds) bug may cause a [checkpoint](https://www.cockroachlabs.com/docs/stable/how-does-an-enterprise-changefeed-work) to be emitted prematurely in rare cases, before all writes below the checkpoint timestamp have been emitted. This could occur if nodes are overloaded or if long-running transactions (several seconds) are involved, such that intent resolution only replicates to a follower running a rangefeed more than 10 seconds after the transaction began. If a cluster using changefeeds experiences this bug, changefeeds will omit these write events, and the following error will be logged:
 
 {% include_cached copy-clipboard.html %}
-~~~ shell
+~~~ none
 cdc ux violation: detected timestamp ... that is less or equal to the local frontier
 ~~~