Update wiki link

README.md

@@ -71,7 +71,7 @@ Once installed, [configure your router to have **DHCP clients use the Pi as thei
 
 -   [Users Forum](https://discourse.pi-hole.net/)
 -   [FAQs](https://discourse.pi-hole.net/c/faqs)
--   [Wiki](https://github.com/pi-hole/pi-hole/wiki/Customization)
+-   [Wiki](https://github.com/pi-hole/pi-hole/wiki)
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