docs(lambda-nodejs): fix typos (#32873)

### Issue # (if applicable)

None

### Reason for this change

Fixed typos in code comments.

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: andyu17

packages/aws-cdk-lib/aws-lambda-nodejs/test/util.test.ts

@@ -123,14 +123,14 @@ describe('exec', () => {
   test('non zero status', () => {
     const spawnSyncMock = jest.spyOn(child_process, 'spawnSync').mockReturnValue({
       status: 999,
-      stderr: Buffer.from('error occured'),
+      stderr: Buffer.from('error occurred'),
       stdout: Buffer.from('stdout'),
       pid: 123,
       output: ['stdout', 'stderr'],
       signal: null,
     });
 
-    expect(() => exec('cmd', ['arg1', 'arg2'])).toThrow('error occured');
+    expect(() => exec('cmd', ['arg1', 'arg2'])).toThrow('error occurred');
 
     spawnSyncMock.mockRestore();
   });