Update 27 files

- /exercices/correction/serie5.pdf
- /exercices/correction/serie 6/21.sql
- /exercices/correction/serie 6/20.sql
- /exercices/correction/serie 6/22.sql
- /exercices/correction/serie 6/COM 4 5.sql
- /exercices/correction/serie 6/23.sql
- /exercices/correction/serie 6/5_et_6.sql
- /exercices/correction/serie 6/18.sql
- /exercices/correction/serie 6/24.sql
- /exercices/correction/serie 6/19.sql
- /exercices/correction/serie 6/4.sql
- /exercices/correction/serie 6/7.sql
- /exercices/correction/serie 6/2.sql
- /exercices/correction/serie 6/3.sql
- /exercices/correction/serie 6/1.sql
- /exercices/correction/serie 6/8.sql
- /exercices/correction/serie 6/9.sql
- /exercices/correction/serie 6/14.sql
- /exercices/correction/serie 6/conf.sql
- /exercices/correction/serie 6/15.sql
- /exercices/correction/serie 6/17.sql
- /exercices/correction/serie 6/16.sql
- /exercices/correction/serie 6/COM 1 2 3.sql
- /exercices/correction/serie 6/12.sql
- /exercices/correction/serie 6/13.sql
- /exercices/correction/serie 6/11.sql
- /exercices/correction/serie 6/10.sql