doc: fix the wrong name of AssertionError

err.name of AssertionError should be 'AssertionError'

PR-URL: #27982
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Rich Trott <rtrott@gmail.com>

doc/api/assert.md

@@ -68,7 +68,7 @@ try {
 } catch (err) {
   assert(err instanceof assert.AssertionError);
   assert.strictEqual(err.message, message);
-  assert.strictEqual(err.name, 'AssertionError [ERR_ASSERTION]');
+  assert.strictEqual(err.name, 'AssertionError');
   assert.strictEqual(err.actual, 1);
   assert.strictEqual(err.expected, 2);
   assert.strictEqual(err.code, 'ERR_ASSERTION');