False positives on SH.MET.PipeLine

### Expected behavior
The comment for a pipe should apply to all of its lines

### Actual behavior
On the CNES RNC example for this rule, which is written over several lines, the 1st line has no violation, but the following ones do. When written on a sigle line there is no violation.

### Steps to reproduce behavior
# Cette commande permet de recherche dans un archive tous les
# fichier d’extension « .c » et d’afficher le plus volumineux
tar tvf ./archive.tar |
awk '{print $3, $6}' |
egrep '\.c$' |
sort -nr |
head -1

### Detection version
3.1.0-dev.alpha4