docs: fix link for Domains section in README (#244)

Signed-off-by: Michael Beemer <beeme1mr@users.noreply.github.com>

Author: beeme1mr

README.md

@@ -350,7 +350,7 @@ client.getBooleanValue(
 
 ### Domains
 
-[Domains](https://openfeature.dev/docs/reference/concepts/domain) allow you to logically bind clients with providers, enabling multiple provider configurations within the same application.
+[Domains](https://openfeature.dev/specification/glossary#domain) allow you to logically bind clients with providers, enabling multiple provider configurations within the same application.
 Support for domains is currently in development.
 
 ### Eventing