April: fix trailing whitespace in GitLab project

doc/administration/job_artifacts_troubleshooting.md

doc/api/project_import_export.md

doc/development/code_review.md

doc/development/documentation/styleguide/index.md

doc/development/lfs.md

doc/install/installation.md

doc/security/ssh_keys_restrictions.md

doc/subscriptions/subscription-add-ons.md

doc/user/ai_features.md

doc/user/group/saml_sso/group_sync.md

doc/user/profile/account/two_factor_authentication.md