doc: add return value to util.promisify

PR-URL: nodejs/node#16040 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]>
ayojs · Oct 26, 2017 · 81738ef · 81738ef
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commit 81738ef
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diff --git a/doc/api/util.md b/doc/api/util.md
@@ -461,6 +461,7 @@ added: v8.0.0
 -->
 
 * `original` {Function}
+* Returns: {Function}
 
 Takes a function following the common Node.js callback style, i.e. taking a
 `(err, value) => ...` callback as the last argument, and returns a version