doc: automated_testing: fix unused reference
doc: automated_testing: fix unused reference

Signed-off-by: Ionela Voinescu <721bf4aa4c535b5f5f0a38815c215c0ece88733b@arm.com>

credp/lisa,credp/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa,ARM-software/lisa,credp/lisa,ARM-software/lisa