[Doc] Multi-project pipeline graphs => Multi-project pipelines
We have a documentation topic for "Multi-project pipeline graphs", but the focus should be on "Multi-project pipelines", which of course includes the graphs, but also the underlying concept. We should expand the documentation a bit as well, including examples of how to configure a multi-project pipeline rather than just linking to the triggers documentation, and including more description around multi-project or cross-project pipelines, including definitions of upstream and downstream pipelines (and making sure to use all those words so people searching for documentation are more likely to find it.
Also, the current article is linked from the pipelines documentation under Pipeline Graphs, so maybe it needs to be raised to a higher section there too.
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Rename topic -
Add example -
Add more description of usage -
Add keywords cross-project, upstream, downstream