vsr: clarify that checking view_durable is not needed in jump_sync

It is correct to check only view, not view_durable here. This can't lead
to a situation where we crash and restart with an older view and a newer
sync target, because superblock updates are serialized.

src/vsr/replica.zig

@@ -8400,6 +8400,14 @@ pub fn ReplicaType(
                 return;
             }
 
+            if (candidate.view > self.view_durable()) {
+                // For ignoring, it is correct to check only view and not view_durable. This can't
+                // lead to a situation where we crash and restart with an older view and a newer
+                // sync target, because superblock updates are serialized.
+                assert(self.view > self.view_durable());
+                assert(self.view_durable_updating());
+            }
+
             // Don't sync backwards, or to our current checkpoint.
             if (candidate.checkpoint_op <= self.op_checkpoint()) return;