Fix and update initial overlay template

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/app/wwctl/overlay/edit/main.go

@@ -20,12 +20,15 @@ const initialTemplate = `# This is a Warewulf Template file.
 # when the overlay is rendered for the individual nodes. Here are some examples
 # of macros and logic which can be used within this file:
 #
-# Node FQDN = {{.Id}}\n")
-# Node Cluster = {{.ClusterName}}\n")
+# Node FQDN = {{.Id}}
+# Node Cluster = {{.ClusterName}}
 # Network Config = {{.NetDevs.eth0.Ipaddr}}, {{.NetDevs.eth0.Hwaddr}}, etc.
 #
-# Goto the documentation pages for more information: http://www.hpcng.org/...
-# Keep the following for better reference
+# Go to the documentation pages for more information:
+# https://warewulf.org/docs/development/contents/overlays.html
+#
+# Keep the following for better reference:
+# ---
 # This file is autogenerated by warewulf
 # Host:   {{.BuildHost}}
 # Time:   {{.BuildTime}}