message: Fix comment in INDEXLIST
diff: ///
  /// Index_type count = 0;
  /// for (Index_type i = ibegin; i < iend; ++i ) {
  -/// if (x[i] < 0.0) { \
  -/// list[count++] = i ; \
  +/// if (x[i] < 0.0) {
  +/// list[count++] = i ;
  /// }
  /// }
  /// Index_type len = count;
  