Uploads docs gives incorrect configuration options

Summary

The documentation page at administration/uploads instructs the user to change two settings (uploads_storage_path and uploads_base_dir to change the path for the uploads directory. In fact, the setting to change is uploads_directory.

What is the current bug behavior?

A customer in this Zendesk ticket was setting the designated values and then getting the following error when attempting to run the rake task to migrate data to their S3 bucket:

ObjectStorage::MigrateUploadsWorker::Report::MigrationFailures: No such file or directory @ rb_sysopen - /gitlab-nfs/uploads/uploads/-/system/project/avatar/1249/Portus_logo.png No such file or directo...

Note the duplicated "uploads" string in the path.

What is the expected correct behavior?

After commenting uploads_storage_path and uploads_base_dir and instead setting gitlab_rails['uploads_directory'] = "/gitlab-nfs/uploads" everything worked correctly.