Update the documentation about how install FD for centos7 with remi's repo

Update the documentation about how install FD for centos7 with remi's repo

added PJ1802-0188 label

added 5m of time spent at 2019-01-18

We need to use remi-php71 and remi (when we enable the repos)

created branch 45-update-the-documentation-about-how-install-fd-for-centos7-with-remi-s-repo

added 20m of time spent at 2019-01-25

mentioned in commit a7b42ab5

mentioned in commit 0454b17a

added Added label