Update graphql md of jh

What does this MR do and why?

Fix job: https://jihulab.com/gitlab-cn/gitlab/-/jobs/12911385

$ bundle exec rake jh:gitlab:graphql:check_docs
##########
#
# JH GraphQL documentation is outdated!
              Please update it by running `bundle exec rake jh:gitlab:graphql:compile_docs`.
#
##########
Uploading artifacts for failed job
00:01
Uploading artifacts...
WARNING: tmp/tests/graphql/gitlab_schema.graphql: no matching files. Ensure that the artifact path is relative to the working directory (/builds/gitlab-cn/gitlab) 
WARNING: tmp/tests/graphql/gitlab_schema.json: no matching files. Ensure that the artifact path is relative to the working directory (/builds/gitlab-cn/gitlab) 
ERROR: No files to upload                          
Cleaning up project directory and file based variables
00:01
ERROR: Job failed: exit code 1

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