docs: fix broken IARC link in documentation (#5893)

Updated the outdated URL for "How IARC works" from .aspx to the correct
working link to prevent a 404 error.


## PR Type
<!-- Please uncomment one ore more that apply to this PR -->

<!-- - Bugfix -->
<!-- - Feature -->
<!-- - Code style update (formatting) -->
<!-- - Refactoring (no functional changes, no api changes) -->
<!-- - Build or CI related changes -->
- Documentation content changes
<!-- - Sample app changes -->
<!-- - Other... Please describe: -->


## Describe the current behavior?
The documentation contained an outdated URL for the IARC website
(`https://www.globalratings.com/how-iarc-works.aspx`) which resulted in
a 404 error.


## Describe the new behavior?
The link has been updated to the current working URL
(`https://www.globalratings.com/how-iarc-works/`).


## PR Checklist

- [ ] Test: run `npm run test` and ensure that all tests pass.
- [x] Target main branch (or an appropriate release branch if
appropriate for a bug fix).
- [ ] Ensure that your contribution follows [standard accessibility
guidelines](https://docs.microsoft.com/en-us/microsoft-edge/accessibility/design).
Use tools like https://webhint.io/ to validate your changes.

Co-authored-by: Judah Gabriel Himango <judahgabriel@gmail.com>

Author: iNikAnn

docs/builder/manifest.md

@@ -182,7 +182,7 @@ In addition to the four display values above, `display_override` can also take t
 `iarc_rating_id` is an optional member that allows you to specify a suitable age range for their application. A rating ID is obtained by answering a questionnaire about an application, and then providing the associated ID for that application.
 
 
-You can read more about IARC <a href="https://www.globalratings.com/how-iarc-works.aspx" aria-label="Click here to read more">here</a> 
+You can read more about IARC <a href="https://www.globalratings.com/how-iarc-works/" aria-label="Click here to read more">here</a> 
 
 
 ```json