[8.11] [ESS][7.17-8.15] Update timeline-api-import.asciidoc (backport

#6329) (#6335)

(cherry picked from commit 6eb3fff)

Co-authored-by: Nastasha Solomon <79124755+nastasha-solomon@users.noreply.github.com>

docs/events/api/timeline-api-import.asciidoc

@@ -34,7 +34,7 @@ Imports the rules in the `timelines_export.ndjson` file:
 
 [source,console]
 --------------------------------------------------
-curl -X POST "api/detection_engine/rules/_import"
+curl -X POST "api/timeline/_import"
 -H 'kbn-xsrf: true' -H 'Content-Type: multipart/form-data'
 --form "file=@timelines_export.ndjson"
 --------------------------------------------------