doc: fix typo in assert.md

change "asssert" to "assert"

PR-URL: #38152
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

doc/api/assert.md

@@ -1951,7 +1951,7 @@ assert.rejects(
 ```
 
 ```cjs
-const asssert = require('assert/strict');
+const assert = require('assert/strict');
 
 assert.rejects(
   Promise.reject(new Error('Wrong value')),