doc: update os.networkInterfaces() example

The os.networkInterfaces() example was outdated
as the IPv6 interfaces did not include the scopeid property,
now they do.

PR-URL: nodejs#25417
Fixes: nodejs#25408
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Weijia Wang <starkwang@126.com>

doc/api/os.md

@@ -286,6 +286,7 @@ The properties available on the assigned network address object include:
       netmask: 'ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff',
       family: 'IPv6',
       mac: '00:00:00:00:00:00',
+      scopeid: 0,
       internal: true,
       cidr: '::1/128'
     }
@@ -304,6 +305,7 @@ The properties available on the assigned network address object include:
       netmask: 'ffff:ffff:ffff:ffff::',
       family: 'IPv6',
       mac: '01:02:03:0a:0b:0c',
+      scopeid: 1,
       internal: false,
       cidr: 'fe80::a00:27ff:fe4e:66a1/64'
     }