doc: Document version introducing ChildProcess 'spawn' event

This replaces a placeholder that was added in the commit which added the new ChildProcess 'spawn' event. Refs: nodejs#35369
zenflow · Oct 28, 2020 · 75343b1 · 75343b1
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commit 75343b1
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diff --git a/doc/api/child_process.md b/doc/api/child_process.md
@@ -1038,7 +1038,7 @@ See [Advanced serialization][] for more details.
 
 ### Event: `'spawn'`
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 The `'spawn'` event is emitted once the child process has spawned successfully.