Merge branch 'dz-fix-clusters-api-doc-2' into 'master'

Fix api docs for deleting project cluster

See merge request gitlab-org/gitlab!19558

changelogs/unreleased/dz-fix-clusters-api-doc-2.yml

+---
+title: Fix api docs for deleting project cluster
+merge_request: 19558
+author:
+type: other

doc/api/project_clusters.md

@@ -382,5 +382,5 @@ Parameters:
 Example request:
 
 ```bash
-curl --header 'Private-Token: <your_access_token>' https://gitlab.example.com/api/v4/projects/26/clusters/23'
+curl --request DELETE --header 'Private-Token: <your_access_token>' https://gitlab.example.com/api/v4/projects/26/clusters/23
 ```