message: Document h5Eget_msg bug
diff: @@ -37,6 +37,9 @@ impl ErrorStack {
  Handle::try_new(stack_id).map(Self)
  }
  + /// Expands the error stack to a format which is easier to handle
  + // known HDF5 bug: H5Eget_msg() used in this function may corrupt
  + // the current stack, so we use self over &self
  pub fn expand(self) -> Result<ExpandedErrorStack> {
  struct CallbackData {
  stack: ExpandedErrorStack,
  