docs/link.html: fix/remove undefined template var "schema"

Author: blueyed

rest_framework/templates/rest_framework/docs/link.html

@@ -99,4 +99,4 @@ <h4>Request Body</h4>
     </div>
 </div>
 
-{% include "rest_framework/docs/interact.html" with link=link schema=schema %}
+{% include "rest_framework/docs/interact.html" with link=link %}