Removed HTML syntax from code block

Closes #123 (closed)

doc.zih.tu-dresden.de/docs/software/virtual_machines.md

@@ -7,7+7,7 @@
 and a compatible kernel. If some of these requirements can not be fulfilled, then there is
 also the option of using the provided virtual machines (VM) on ZIH systems.
 
 Currently, starting VMs is only possible on partitions `ml` and HPDLF. The VMs on the ML nodes are
 used to build singularity containers for the Power9 architecture and the HPDLF nodes to build
 Singularity containers for the x86 architecture.
 
@@ -45,7+45,7 @@
 bash-4.2$ cat /tmp/marie_2759627/activate
 #!/bin/bash
 
-if ! grep -q -- "Key for the VM on the partition ml" "/home/rotscher/.ssh/authorized_keys" >& /dev/null; then
+if ! grep -q -- "Key for the VM on the partition ml" "/home/rotscher/.ssh/authorized_keys" > /dev/null; then
   cat "/tmp/marie_2759627/kvm.pub" >> "/home/marie/.ssh/authorized_keys"
 else
   sed -i "s|.*Key for the VM on the partition ml.*|ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC3siZfQ6vQ6PtXPG0RPZwtJXYYFY73TwGYgM6mhKoWHvg+ZzclbBWVU0OoU42B3Ddofld7TFE8sqkHM6M+9jh8u+pYH4rPZte0irw5/27yM73M93q1FyQLQ8Rbi2hurYl5gihCEqomda7NQVQUjdUNVc6fDAvF72giaoOxNYfvqAkw8lFyStpqTHSpcOIL7pm6f76Jx+DJg98sXAXkuf9QK8MurezYVj1qFMho570tY+83ukA04qQSMEY5QeZ+MJDhF0gh8NXjX/6+YQrdh8TklPgOCmcIOI8lwnPTUUieK109ndLsUFB5H0vKL27dA2LZ3ZK+XRCENdUbpdoG2Czz Key for the VM on the partition ml|" "/home/marie/.ssh/authorized_keys"