The help.html file and help_ja.html file currently contain a syntax error in the checkout scmGit example. The code snippet is written as:

checkout scmGit(branches: [[name: 'main]],
    userRemoteConfigs: [[url: 'https://git-server/user/repository.git']]) 

However, the correct syntax should include the missing closing bracket for the branches list. It should be written as:

checkout scmGit(branches: [[name: 'main']],
    userRemoteConfigs: [[url: 'https://git-server/user/repository.git']])

I fix it, GitHub PR