message: net, doc: provide context for UnserializeV1Array()
diff: @@ -385,6 +385,12 @@ private:
  /**
  * Unserialize from a pre-ADDRv2/BIP155 format from an array.
  + *
  + * This function is only called from UnserializeV1Stream() and is a wrapper
  + * for SetLegacyIPv6(); however, we keep it for symmetry with
  + * SerializeV1Array() to have pairs of ser/unser functions and to make clear
  + * that if one is altered, a corresponding reverse modification should be
  + * applied to the other.
  */
  void UnserializeV1Array(uint8_t (&arr)[V1_SERIALIZATION_SIZE])
  {
  