[#10,!3] Template updated.

doc/api/_template.json

 {
+    // This specifies the name of the command. Must be the same as the filename.
     "name": "template-command",
+
+    // This provides a short description.
     "brief": "a sentence or two explaining what it is",
-    "support": [ "kea-dhcp4", "kea-dhcp6" ],
-    "avail": "first version, possible a hook library name and (premium) if applicable",
 
+    // This provides a full description. Since we have most (all?) commands
+    // already documented, we don't want to copy over the text. Instead,
+    // we provide links to specific section.
+    "description": "See <xref linkend=\"anchor-in-the-docs\"/>",
+
+    // This enumerates the daemons that are able to handle specific command.
+    // Usually this will be a subset of those specifeid below as there are very
+    // few commands that are supported by every daemon.
+    "support": [ "kea-dhcp4", "kea-dhcp6", "dhcp-ddns", "ca", "netconf" ],
+
+    // Historical information. May need a bit of digging, but this info can
+    // be extracted by looking at older Kea user guides. We have them published
+    // on FTP.
+    "avail": "first version the command appeared in",
+
+    // Many commands are provided by a hook. Specify the name of the hook here.
+    // If this hook is provided by the deamons natively (without needing to load
+    // a hook), remove the whole "hook" entry.
+    "hook": "name of the hook that provides this command. remove if provided by
+             the core code",
+
+    // This defines a syntax of the command
     "cmd-syntax": "Syntax of the command",
+
+    // This defines a description printed immediately below the command syntax.
     "cmd-comment": "Possibly some extra comments after the syntax.",
 
+    // This defines a syntax of the response
     "resp-syntax": "Syntax of the response",
+
+    // This defines a description printed immediately below th response syntax.
     "resp-comment": "Optional extra comments after the respone syntax."
 }