Document dns_nsupdate provider in managing DNS section

guides/common/assembly_managing-dns-on-smart-proxies.adoc

@@ -1,5 +1,7 @@
 include::modules/con_managing-dns-by-using-smartproxy.adoc[]
 
+include::modules/proc_configuring-dns-nsupdate.adoc[leveloffset=+1]
+
 ifndef::satellite[]
 include::modules/proc_configuring-dns-libvirt.adoc[leveloffset=+1]
 

guides/common/modules/con_managing-dns-by-using-smartproxy.adoc

@@ -17,8 +17,8 @@ ifndef::satellite[]
 * `dns_libvirt` {endash} Dnsmasq DNS via libvirt API.
 For more information, see xref:configuring_dns_libvirt_{context}[].
 endif::[]
-* `dns_nsupdate` {endash} Dynamic DNS update by using nsupdate.
-For more information, see {ProvisioningDocURL}Using_Infoblox_as_DHCP_and_DNS_Providers_provisioning[Using Infoblox as DHCP and DNS Providers] in _{ProvisioningDocTitle}_.
+* `dns_nsupdate` {endash} Dynamic DNS update using nsupdate.
+For more information, see xref:configuring_dns_nsupdate_{context}[].
 * `dns_nsupdate_gss` {endash} Dynamic DNS update with GSS-TSIG.
 For more information, see xref:configuring-dynamic-dns-update-with-gss-tsig-authentication_{context}[].
 ifndef::satellite[]

guides/common/modules/proc_configuring-dns-nsupdate.adoc

@@ -0,0 +1,20 @@
+[id="configuring_dns_nsupdate_{context}"]
+= Configuring dns_nsupdate
+
+The _dns_nsupdate_ DNS provider manages DNS records using the `nsupdate` utility.
+You can use _dns_nsupdate_ with any DNS server compatible with https://www.rfc-editor.org/rfc/rfc2136[RFC2136].
+By default, _dns_nsupdate_ installs the ISC BIND server.
+For installation without ISC BIND, see xref:configuring-external-dns_{context}[].
+
+.Procedure
+* Configure `dns_nsupdate`:
++
+[options="nowrap", subs="+quotes,verbatim,attributes"]
+----
+# {foreman-installer} \
+--foreman-proxy-dns true \
+--foreman-proxy-dns-provider nsupdate \
+--foreman-proxy-dns-managed true \
+--foreman-proxy-dns-zone _example.com_ \
+--foreman-proxy-dns-reverse _2.0.192.in-addr.arpa_
+----