fix: change geo region doc link

[Soare-Robert-Daniel]

Summary

Change the dead link.

[!NOTE] I also updated the one from the block even if we no longer use it.

Will affect visual aspect of the product

NO

Screenshots

Test instructions

• Create a Geo Chart
• Check the link on 3-digit from Settings > Map Settings > Region

Check before Pull Request is ready:

• [ ] ~I have written a test and included it in this PR~
• [X] I have run all tests and they pass
• [X] The code passes when running the PHP CodeSniffer
• [X] Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• [X] Security and Sanitization requirements have been followed
• [x] I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/visualizer-pro/issues/478

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