Rails cheatsheet: Align variables and update Service params

doc/administration/troubleshooting/gitlab_rails_cheat_sheet.md

@@ -824,28 +824,28 @@ conflicting_permanent_redirects.destroy_all
 ### Close a merge request properly (if merged but still marked as open)
 
 ```ruby
-p = Project.find_by_full_path('<full/path/to/project>')
-m = p.merge_requests.find_by(iid: <iid>)
 u = User.find_by_username('<username>')
-MergeRequests::PostMergeService.new(p, u).execute(m)
+p = Project.find_by_full_path('<namespace/project>')
+m = p.merge_requests.find_by(iid: <iid>)
+MergeRequests::PostMergeService.new(project: p, current_user: u).execute(m)
 ```
 
 ### Delete a merge request
 
 ```ruby
 u = User.find_by_username('<username>')
-p = Project.find_by_full_path('<group>/<project>')
-m = p.merge_requests.find_by(iid: <IID>)
-Issuable::DestroyService.new(m.project, u).execute(m)
+p = Project.find_by_full_path('<namespace/project>')
+m = p.merge_requests.find_by(iid: <iid>)
+Issuable::DestroyService.new(project: m.project, current_user: u).execute(m)
 ```
 
 ### Rebase manually
 
 ```ruby
-p = Project.find_by_full_path('<project_path>')
-m = project.merge_requests.find_by(iid: )
 u = User.find_by_username('<username>')
-MergeRequests::RebaseService.new(m.target_project, u).execute(m)
+p = Project.find_by_full_path('<namespace/project>')
+m = p.merge_requests.find_by(iid: <iid>)
+MergeRequests::RebaseService.new(project: m.target_project, current_user: u).execute(m)
 ```
 
 ## CI