test: assertions arguments match docs

PR-URL: #23594
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>

test/parallel/test-pipe-head.js

@@ -13,5 +13,5 @@ const cmd = `"${nodePath}" "${script}" | head -2`;
 exec(cmd, common.mustCall(function(err, stdout, stderr) {
   assert.ifError(err);
   const lines = stdout.split('\n');
-  assert.strictEqual(3, lines.length);
+  assert.strictEqual(lines.length, 3);
 }));