Implement hook_help()

I have created MR. Please review it.

I have reviewed & Implemented the MR! on my Drupal website having version 9.5, PHP version - 8.1
The hook_help has been implemented successfully. Can be moved to RTBC!
Please & Thank You.

After applying the MR 2 on 9.5.8 getting a website encounter error on help. See the screenshot for reference.

@Tanuja, Please use the following namespace in your .module file
use Drupal\Core\Routing\RouteMatchInterface;
It will resolve the issue. And thank you.
Please see my attached ss for reference.

I am adding my complete patch for it. Please test. Thank you.

@Raveen, thanks working for me now.

@Tanuja. Okay, Thank You for confirming.