[issue46071] Graphlib documentation (edge direction)

[Dennis Sweeney]

Dennis Sweeney <sweeney.dennis650 at gmail.com> added the comment:

> It's not obvious if the "predecessor" should be the start or the end point of the edge

https://en.wikipedia.org/wiki/Directed_graph#Basic_terminology :
"""If a path leads from x to y, then y is said to be a successor of x and reachable from x, and x is said to be a predecessor of y."""

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nosy: +Dennis Sweeney

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