message: doc: IsSnapshotActive
diff: @@ -904,6 +904,8 @@ public:
  return m_blockman.m_block_index;
  }
  + //! @returns true if a snapshot-based chainstate is in use. Also implies
  + //! that a background validation chainstate is also in use.
  bool IsSnapshotActive() const;
  std::optional<uint256> SnapshotBlockhash() const;
  