doc: clarify when child process 'spawn' event is *not* emitted

Making this clarification in response to a comment on GitHub: #35288 (comment) PR-URL: #37833 Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: James M Snell <[email protected]>
nodejs · Mar 24, 2021 · c0a424f · c0a424f
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commit c0a424f
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diff --git a/doc/api/child_process.md b/doc/api/child_process.md
@@ -1162,6 +1162,8 @@ added: v15.1.0
 -->
 
 The `'spawn'` event is emitted once the child process has spawned successfully.
+If the child process does not spawn successfully, the `'spawn'` event is not
+emitted and the `'error'` event is emitted instead.
 
 If emitted, the `'spawn'` event comes before all other events and before any
 data is received via `stdout` or `stderr`.