Fix example on address | ipsubnet(20) usage (#54388)

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`192.168.128.0/20` does not contain `192.168.144.5`, the correct subnet is `192.168.144.0/20` (which is what is rendered on my test template).
+label: docsite_pr

docs/docsite/rst/user_guide/playbooks_filters_ipaddr.rst

@@ -479,7 +479,7 @@ the first argument, the ``ipsubnet()`` filter will instead return the biggest su
 contains that given IP address::
 
     # {{ address | ipsubnet(20) }}
-    192.168.128.0/20
+    192.168.144.0/20
 
 By specifying an index number as a second argument, you can select smaller and
 smaller subnets::