Fix formatting typo

Author: vishaangelova

docs/en/ingest-management/release-notes/release-notes-8.17.asciidoc

@@ -468,6 +468,7 @@ curl -XPOST --user elastic:${SUPERUSER_PASS} -H 'x-elastic-product-origin:fleet'
 # Issue an update_by_query request that targets effected agents:
 curl -XPOST -H 'Authorization: Bearer ${TOKEN}' -H 'x-elastic-product-origin:fleet' -H 'content-type:application/json' "https://${ELASTICSEARCH_HOST}/.fleet-agents/_update_by_query" -d '{"query": {"bool": {"must": [{ "exists": { "field": "unenrolled_at" } }],"must_not": [{ "term": { "active": "false" } }]}},"script": {"source": "ctx._source.unenrolled_at = null;","lang": "painless"}}'
 ----
+====
 
 [discrete]
 [[new-features-8.17.0]]