typo

Co-authored-by: Ronan Keryell <ronan@keryell.fr>

Author: reble

sycl/doc/extensions/proposed/sycl_ext_oneapi_graph.asciidoc

@@ -421,7 +421,7 @@ int main() {
   auto node_f1 = g.free(x, {node_c});
   auto node_f1 = g.free(y, {node_b});
 
-  auto exec = compile(q);
+  auto exec = g.compile(q);
 
   q.submit(exec).wait();