on relation-queries, in update bulk, the examples could be better

[macMikey]

this is really nitpicky, thus raising an issue rather than submitting a PR
in bulk attach rows and bulk detach rows the examples are kind-of silly, because we first query by id, which is going to result in only one record being retrieved.
thoughts?

[Isakdl]

Yes you are right, it is nit but would make more sense with something more "real-world".