Include note about IPv4 interface ID (nsupdate-info#495)

docs: include note about IPv4 interface ID The documentation was unclear how I can have the same IPv4 address for a related host. I found the solution in nsupdate-info#133 and thought I might help to include this into the documentation.
the-nic · Jul 13, 2022 · a5db72c · a5db72c
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commit a5db72c
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diff --git a/docs/user.rst b/docs/user.rst
@@ -216,6 +216,8 @@ Note:
   make sure you send this device's IPv6 address with the update (myip=...) or
   run the updater on that device and make sure the request originates from
   the IPv6 address you want in DNS.
+* if you want the related host to point to the same IPv4 address as the main
+  host (which is often the router), use 0 as the interface ID.
 
 
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