doc: describe process API for IPC by sam-github · Pull Request #1978 · nodejs/node
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Why? There are over a hundred examples in the API docs of the markup above, including one to this specific event.
Separating out to a ref at the bottom is useful when there are multiple uses made of that ref, otherwise I don't see the point.
If there is a stylistic or technical reason to change all markdown refs to the format you used in #2142, writing a tool to convert them all would be a good way, but that is out of scope here.