Update marketing-tags-properties.mdx

This updates to the use the `properties` property of the Register component instead of the `authUrlParams` which does not exist in latest version of the SDK

Author: DanielRivers

src/content/docs/properties/work-with-properties/marketing-tags-properties.mdx

@@ -75,14 +75,14 @@ For example in the React SDK:
 ```jsx
 <RegisterLink
   className="btn btn-dark"
-  authUrlParams={{
+  properties={{
     utm_source: "my source",
-   utm_medium: "some medium",
-   utm_campaign: "awesome campaing",
-   utm_content: "something else",
-   utm_term: "my terms",
-   click_id: "1234",
-}}
+    utm_medium: "some medium",
+    utm_campaign: "awesome campaing",
+    utm_content: "something else",
+    utm_term: "my terms",
+    click_id: "1234"
+  }}
 >Register</RegisterLink>
 ```