fix(ci): fix typo to re-run CI

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

ci-scripts/Jenkinsfile-GitLab-Docker

@@ -260,7 +260,7 @@ pipeline {
     }
     stage('Testing whole 5g Core Network Functions') {
       parallel {
-        stage ('Testing the tutorial') {
+        stage ('Testing the tutorials') {
           steps {
             script {
               gitlabCommitStatus(name: "Test tutorials") {