[8.x] [doc] Allow copying as curl for saved object rollback instructi…

…ons (elastic#200187) (elastic#200520)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[doc] Allow copying as curl for saved object rollback instructions
(elastic#200187)](elastic#200187)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Allow copying as curl for saved object rollback instructions
(elastic#200187)\n\n## Summary\r\n\r\nChanged the doc file so it allows to copy
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Allow copying as curl for saved object rollback
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Allow copying as curl for saved object rollback instructions
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Allow copying as curl for saved object rollback instructions
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BACKPORT-->

Co-authored-by: Jesus Wahrman <[email protected]>

docs/setup/upgrade/rollback-migration.asciidoc

@@ -20,7 +20,7 @@ To roll back after a failed upgrade migration, you must also roll back the {kib}
 . To make sure no {kib} instances are performing an upgrade migration, shut down all {kib} instances.
 . {ref}/snapshots-restore-snapshot.html[Restore] the `kibana` feature state from a snapshot taken before the failed {kib} upgrade. The following {es} request will only restore the {kib} feature state 
 +
-[source,sh]
+[source,console]
 --------------------------------------------
 POST _snapshot/my_repository/my_snapshot_2099.05.06/_restore
 {