Update cour4.md

informatique/admin/materiel/cour4.md

 ## lsb_release -a
+```
 No LSB modules are available.
 Distributor ID:	Debian
 Description:	Debian GNU/Linux 9.2 (stretch)
 Release:	9.2
 Codename:	stretch
+```
 
 ## uname -a
+```
 Linux cour4 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u5 (2017-09-19) x86_64 GNU/Linux
+```
 
 ## hwinfo
+```
 cpu:
                        Intel(R) Pentium(R) CPU G3240 @ 3.10GHz, 800 MHz
                        Intel(R) Pentium(R) CPU G3240 @ 3.10GHz, 800 MHz
@@ -68,4 +73,5 @@ unknown:
                        PS/2 Controller
                        Intel 8 Series/C220 Series Chipset Family SMBus Controller
                        Intel 8 Series/C220 Series Chipset Family MEI Controller #1
-  /dev/ttyS0           16550A
\ No newline at end of file
+  /dev/ttyS0           16550A
+```
\ No newline at end of file