change formatting

input examples are now given as

```bash
input $ARG1
```

While outputs use md's '> ' sign as a quote.

system/fstab.md

@@ -15,11 +15,9 @@ The ordering of `/etc/fstab` is
 
 E.g.:
 
-```
-UUID=877f14e8-4738-46b0-884f-ba330dad1a7d       /mnt/biggie                     ext4        nofail,rw,relatime      0 2
-
-UUID=B21648C416488AF5 /mnt/share ntfs       nofail,rw,nosuid,nodev,user_id=0,group_id=0,allow_other,blksize=4096 0 0
-```
+> UUID=877f14e8-4738-46b0-884f-ba330dad1a7d       /mnt/biggie                     ext4        nofail,rw,relatime      0 2
+> 
+> UUID=B21648C416488AF5 /mnt/share ntfs       nofail,rw,nosuid,nodev,user_id=0,group_id=0,allow_other,blksize=4096 0 0
 
 ## 5: Dump