Update obsolete script reference in QC MC documentation (#1839)

The original example script was deleted by Benedikt in March and superseded by `O2DPG_pp_minbias.sh`.

MC/README.md

@@ -18,7 +18,7 @@ Corresponding files will be created in the current directory, QC objects will be
 ```
 alienv enter O2/latest O2Physics/latest QualityControl/latest O2DPG/latest
 cd MC/run/examples
-./O2DPG_pp_minbias_multiple_tf_qc.sh
+./O2DPG_pp_minbias.sh
 ```
 If the script does not succeed, contact the repository maintainers.
 Sometimes an intermittent issue might appear, then it might be worth executing the script again - it will pick up from the latest failed task.
@@ -67,7 +67,7 @@ def include_all_QC_finalization(ntimeframes, standalone):
 
 ```
 
-6. Delete the files generated by the workflow during step 2 and run the `O2DPG_pp_minbias_multiple_tf_qc.sh` script again.
+6. Delete the files generated by the workflow during step 2 and run the `O2DPG_pp_minbias.sh` script again.
 Verify that the QC Task succeeds.
 You can run only the parts of the workflow which are required to reach your QC task by adding `-tt <task_name>_finalize` to `o2_dpg_workflow_runner.py`.
 Logs are available under task names in their working directories: tf<n> when processing TFs and QC during finalization.
@@ -90,7 +90,7 @@ Add your QC post-processing workflow there using the `add_QC_postprocessing` fun
 See its in-code documentation for argument explanation and follow the existing examples.
 Please make sure to set the correct `needs`, so the post-processing workflow is executed only when the required QC objects are already in the QCDB.
 
-3. Delete the files generated by the workflow during the previous steps and run the `O2DPG_pp_minbias_multiple_tf_qc.sh` script again.
+3. Delete the files generated by the workflow during the previous steps and run the `O2DPG_pp_minbias.sh` script again.
 Verify that the QC post-processing workflow succeeds.
 You can run only the parts of the workflow which are required to reach your QC task by adding `-tt <task_name>_finalize` to `o2_dpg_workflow_runner.py`.
 Relevant logs are available under task names in the `QC` directory.