refactor code based on feedback

doc/api/project_import_export.md

@@ -22,7 +22,7 @@ The `file=` parameter must point to a file on your filesystem and be preceded
 by `@`. For example:
 
 ```console
-curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" -F "path=api-project" -F "file=@/path/to/file" https://gitlab.example.com/api/v4/projects/import
+curl --request POST --header "PRIVATE-TOKEN: 9koXpg98eAheJpvBs5tK" --form "path=api-project" --form "file=@/path/to/file" https://gitlab.example.com/api/v4/projects/import
 ```
 
 ```json

spec/requests/api/project_import_spec.rb

@@ -17,7 +17,7 @@ describe API::ProjectImport do
 
   describe 'POST /projects/import' do
     it 'schedules an import using a namespace' do
-      stub_import(user.namespace)
+      stub_import(namespace)
 
       post api('/projects/import', user), path: 'test-import', file: fixture_file_upload(file), namespace: namespace.id
 
@@ -25,7 +25,7 @@ describe API::ProjectImport do
     end
 
     it 'schedules an import using the namespace path' do
-      stub_import(unamespace)
+      stub_import(namespace)
 
       post api('/projects/import', user), path: 'test-import', file: fixture_file_upload(file), namespace: namespace.full_path