message: doc: add comment about CCoinsViewDBCursor constructor
diff: @@ -172,6 +172,8 @@ bool CBlockTreeDB::ReadLastBlockFile(int &nFile) {
  class CCoinsViewDBCursor: public CCoinsViewCursor
  {
  public:
  + // Prefer using CCoinsViewDB::Cursor() since we want to perform some
  + // cache warmup on instantiation.
  CCoinsViewDBCursor(CDBIterator* pcursorIn, const uint256&hashBlockIn):
  CCoinsViewCursor(hashBlockIn), pcursor(pcursorIn) {}
  ~CCoinsViewDBCursor() {}
  