Make help text correct for both CSA and TV testing.
Make help text correct for both CSA and TV testing.

tjenkinson/dvbcss-synctiming,ramdhany/dvbcss-synctiming,ramdhany/dvbcss-synctiming,bbc/dvbcss-synctiming,tjenkinson/dvbcss-synctiming,bbc/dvbcss-synctiming