switch /srv to sdb, now that swap partition is gone

howto/new-machine.md

@@ -272,8 +272,8 @@ above](#pre-requisites)! Some installers cover all of those steps, but most do n
     system. Typically, installers may create the partition, but will
     *not* create the filesystem and configure it in `/etc/fstab`:
 
-        mkfs -t ext4 -j /dev/sdc &&
-        printf 'UUID=%s\t/srv\text4\tdefaults\t1\t2\n' $(blkid --match-tag UUID --output value /dev/sdc) >> /etc/fstab  &&
+        mkfs -t ext4 -j /dev/sdb &&
+        printf 'UUID=%s\t/srv\text4\tdefaults\t1\t2\n' $(blkid --match-tag UUID --output value /dev/sdb) >> /etc/fstab  &&
         mount /srv
 
  9. once everything is done, reboot the new machine to make sure