Tweak PDU diagram demonstrating prev_events
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#3340
Merged
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This tweaks the example DAG at https://spec.matrix.org/unstable/server-server-api/#pdus to be simpler, with two linear event chains E4 -> E3 -> E2 -> E1 and E6 -> E5 -> E2 -> E1. The extremities of the DAG are now the first and only point in the DAG where multiple event parents occur.
Since the point of the diagram is to demonstrate this very situation, it's better didactically if there is only one such situation in the diagram.
Prompted by this discussion.