Updates a VPP invitation by ID

<vpp_invitation>
    <general>
        <name>Sample invitation</name>
        <vpp_account>
            <id>1</id>
        </vpp_account>
        <distribution_method>Send emails</distribution_method>
        <sender_name>[email protected]</sender_name>
        <sender_email_address>[email protected]</sender_email_address>
        <subject>Your Invite</subject>
        <message>Click the link to register with VPP.&#13;
&#13;
	%@&#13;
</message>
        <require_login>false</require_login>
        <auto_register_managed_users>false</auto_register_managed_users>
    </general>
    <scope>
        <all_jss_users>false</all_jss_users>
        <jss_users/>
        <jss_user_groups/>
        <limitations>
            <user_groups/>
        </limitations>
        <exclusions>
            <jss_users/>
            <jss_user_groups/>
            <user_groups/>
        </exclusions>
    </scope>
</vpp_invitation>