Add a bit of docs

kubernetes/loculus/silo_import_job.sh

@@ -150,6 +150,8 @@ download_data() {
   echo
 }
 
+# Generate the preprocessing config file with the lineage file for the current pipeline version.
+# the lineage definition file needs to be downloaded first.
 prepare_preprocessing_config() {
   rm $lineage_definition_file $preprocessing_config_file