doc: fix a typo in util.isDeepStrictEqual

PR-URL: nodejs#18775
Reviewed-By: Weijia Wang <[email protected]>
Reviewed-By: Ruben Bridgewater <[email protected]>
Reviewed-By: Benjamin Gruenbaum <[email protected]>
Reviewed-By: James M Snell <[email protected]>
Reviewed-By: Vse Mozhet Byt <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Roman Reiss <[email protected]>

Author: Sho Miyamoto

doc/api/util.md

@@ -627,7 +627,7 @@ added: v9.0.0
 * `val2` {any}
 * Returns: {boolean}
 
-Returns `true` if there is deep strict equality between `val` and `val2`.
+Returns `true` if there is deep strict equality between `val1` and `val2`.
 Otherwise, returns `false`.
 
 See [`assert.deepStrictEqual()`][] for more information about deep strict