Remove reference to JSON argument in documentation of hlt2_check_output

Just a small update in the documentation...

added Persistency testing labels

added RTA label

added 1 commit

• 2006106a - Update hlt2_check_output.py

Compare with previous version

mentioned in issue #669 (closed)

mentioned in issue #671 (closed)

approved this merge request

merged

mentioned in commit 859db7da