Add missing SELinux and resolv.conf preflights

Author: ajp-io

docs/partials/embedded-cluster/_requirements.mdx

@@ -8,4 +8,6 @@
   * The filesystem at `/var/openebs` has 5Gi or more of space available
   * The filesystem at `/tmp` has 5Gi or more of space available
 * (Online installations only) Access to replicated.app and proxy.replicated.com or your custom domain for each
+* Neither `nameserver localhost` nor `namerserver 127.0.0.1` can be present in resolv.conf
+* SELinux must be disabled or in run in permissive mode, and AppArmor must be disabled or run in complain mode
 * Embedded Cluster is based on k0s, so all k0s system requirements apply. See [System requirements](https://docs.k0sproject.io/stable/system-requirements/) in the k0s documentation.