fix typo

3 jobs for MC_lecture_notes_david in 1 minute and 47 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed build lectures #175412

00:01:18

 
  Deploy
passed deploy test version #175413

00:00:20

failed undeploy test version #175414
allowed to fail manual

00:00:08

 
Name Stage Failure
failed
undeploy test version Deploy
Using docker image sha256:af26b63af6c46d7b8c2733f69ffca184ff76da56c93fe4a0eaf140efee0d989c for quantumtinkerer/research ...
Authenticating with credentials from /root/.docker/config.json
Running on runner-a9da50a7-project-1226-concurrent-0 via tnw-tn3.tudelft.net...
Authenticating with credentials from /root/.docker/config.json
Fetching changes with git depth set to 50...
Reinitialized existing Git repository in /builds/computational_physics/lectures/.git/
fatal: couldn't find remote ref refs/heads/MC_lecture_notes_david
Authenticating with credentials from /root/.docker/config.json
ERROR: Job failed: exit code 1