Remove unnecessary newline on Help page

doc/README.md

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 - [Security](security/README.md) Learn what you can do to further secure your GitLab instance.
 - [Update](update/README.md) Update guides to upgrade your installation.
 - [Audit Events](administration/audit_events.md) Check how user access changed in projects and groups.
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 - [Branded login page](customization/branded_login_page.md) Change the login page appearance for your GitLab instance.
 - [Help message](customization/help_message.md) Set information about administrators of your GitLab instance.
 - [Git Hooks](git_hooks/git_hooks.md) Advanced push rules for your project.