docs: update macos executor with the correct resource class link

Author: imlogang

src/executors/macos.yml

@@ -4,7 +4,7 @@ parameters:
     type: string
     default: "12.5.1"
   resource_class:
-    description: You can use whatever resource class your plan has access to. See https://circleci.com/docs/configuration-reference/#resourceclass
+    description: You can use whatever resource class your plan has access to. See https://circleci.com/docs/using-macos/#available-resource-classes
     type: string
     default: macos.x86.medium.gen2
 macos: