task_qc_viewer: update doc

Author: oliche

task_qc_viewer/README.md

@@ -25,7 +25,9 @@ ipython task_qc.py c9fec76e-7a20-4da4-93ad-04510a89473b
 
 Or just using a local path (on a local server for example):
 ```
-ipython task_qc.py /mnt/s0/Subjects/KS022/2019-12-10/001 --local
+python task_qc.py /mnt/s0/Subjects/KS022/2019-12-10/001 --local
+# or with ipython
+ipython task_qc.py -- /mnt/s0/Subjects/KS022/2019-12-10/001 --local
 ```
 
 ## Usage: from ipython prompt