Ceph » rgw

There are over 1500 options in the source as of today. `rgw_multipart_min_part_size` is marked as `ADVANCED`, and I think policy (perhaps unwritten?) is that advanced options aren't necessarily documented. Before I add this in, @zdover23 do you have any thoughts?

    Option("rgw_multipart_min_part_size", Option::TYPE_SIZE, Option::LEVEL_ADVANCED)
    .set_default(5_M)
    .set_description("Minimum S3 multipart-upload part size")
    .set_long_description(
    "When doing a multipart upload, each part (other than the last part) should be " 
        "at least this size."),

@Matt Benjamin @yehudasa Any thoughts re whether this should, or should not, be explicitly documented in https://docs.ceph.com/en/latest/radosgw/config-ref/ ?