Fix llms.txt

Author: 0xLucca

llms.txt

@@ -14323,7 +14323,44 @@ touch /etc/systemd/system/polkadot-validator.service
 In this unit file, you will write the commands that you want to run on server boot/restart:
 
 ```systemd title="/etc/systemd/system/polkadot-validator.service"
-Failed to fetch snippet after 3 attempts
+[Unit]
+Description=Polkadot Node
+After=network.target
+Documentation=https://github.com/paritytech/polkadot-sdk
+
+[Service]
+EnvironmentFile=-/etc/default/polkadot
+ExecStart=/usr/bin/polkadot $POLKADOT_CLI_ARGS
+User=polkadot
+Group=polkadot
+Restart=always
+RestartSec=120
+CapabilityBoundingSet=
+LockPersonality=true
+NoNewPrivileges=true
+PrivateDevices=true
+PrivateMounts=true
+PrivateTmp=true
+PrivateUsers=true
+ProtectClock=true
+ProtectControlGroups=true
+ProtectHostname=true
+ProtectKernelModules=true
+ProtectKernelTunables=true
+ProtectSystem=strict
+RemoveIPC=true
+RestrictAddressFamilies=AF_INET AF_INET6 AF_NETLINK AF_UNIX
+RestrictNamespaces=false
+RestrictSUIDSGID=true
+SystemCallArchitectures=native
+SystemCallFilter=@system-service
+SystemCallFilter=landlock_add_rule landlock_create_ruleset landlock_restrict_self seccomp mount umount2
+SystemCallFilter=~@clock @module @reboot @swap @privileged
+SystemCallFilter=pivot_root
+UMask=0027
+
+[Install]
+WantedBy=multi-user.target
 ```
 
 !!! warning "Restart delay and equivocation risk"