Updated URL for apple manufacturer

[snipe]

Changed the URL from support.apple.com to the corrected checkcoverage.apple.com in the example text.

[what-the-diff]

PR Summary

• Update of the Support URL Example in 'message.php'
  The help message displayed to users regarding the format of Manufacturer Support URLs has been updated in our system. The example URL, which was previously based on Apple's old support URL, has now been updated to reflect Apple's current coverage check URL. This change ensures the accuracy of the guidance given to users while using our system.