Add missing reference to `tests-sample.lgt` file to `lgtunit` notes
Add missing reference to `tests-sample.lgt` file to `lgtunit` notes

LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3,LogtalkDotOrg/logtalk3