[gpuref] Fix typo

5 jobs for grouille in 5 minutes and 40 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Validate
passed rubocop #957413
grid5000-docker

00:00:23

passed validate-data #957414
grid5000-docker

00:01:32

 
  Generate
passed generate-reference-api #957415
grid5000-docker

00:01:23

 
  Deploy
passed deploy #957416
grid5000-shell

00:00:06

passed rspec #957417
grid5000-docker

00:02:44