docs(diagram): re-execute notation notebooks against the final #1492 build

Regenerates read-diagrams and model-relationships against datajoint-python
#1508 at its final keyed-edge implementation (edges keyed by the FK-attribute
tuple). Renamed FKs render as orange edges with rename tooltips; genuine
parallel FKs (Person/Marriage, Neuron/Synapse, Session/Comparison) each show
their two distinct edges — no duplication.

Author: dimitri-yatsenko