message: Stabilize multilevel
diff: @@ -52,8 +52,8 @@ impl<'a, T: ReadonlyStorage> ReadonlyPrefixedStorage<'a, T> {
  }
  }
  - // note: multilevel is here for demonstration purposes, but may well be removed
  - // before exposing any of these demo apis
  + // Nested namespaces as documented in
  + // https://github.com/webmaster128/key-namespacing#nesting
  fn multilevel(namespaces: &[&[u8]], storage: &'a T) -> Self {
  ReadonlyPrefixedStorage {
  prefix: key_prefix_nested(namespaces),
  @@ -83,8 +83,8 @@ impl<'a, T: Storage> PrefixedStorage<'a, T> {
  }
  }
  - // note: multilevel is here for demonstration purposes, but may well be removed
  - // before exposing any of these demo apis
  + // Nested namespaces as documented in
  + // https://github.com/webmaster128/key-namespacing#nesting
  fn multilevel(namespaces: &[&[u8]], storage: &'a mut T) -> Self {
  PrefixedStorage {
  prefix: key_prefix_nested(namespaces),
  