Fix tutorial code

Author: qinsoon

docs/userguide/src/tutorial/code/mygc_semispace/global.rs

@@ -181,9 +181,9 @@ impl<VM: VMBinding> MyGC<VM> {
         let res = MyGC {
             hi: AtomicBool::new(false),
             // ANCHOR: copyspace_new
-            copyspace0: CopySpace::new(plan_args.get_space_args("copyspace0", true, false, VMRequest::discontiguous()), false),
+            copyspace0: CopySpace::new(plan_args.get_normal_space_args("copyspace0", true, false, VMRequest::discontiguous()), false),
             // ANCHOR_END: copyspace_new
-            copyspace1: CopySpace::new(plan_args.get_space_args("copyspace1", true, false, VMRequest::discontiguous()), true),
+            copyspace1: CopySpace::new(plan_args.get_normal_space_args("copyspace1", true, false, VMRequest::discontiguous()), true),
             common: CommonPlan::new(plan_args),
         };