Add Magnum 9511 to default ports documentation

[Gregory Orange]

- [x] This is a doc addition request.

The page does not mention Magnum or port 9511. It is mentioned e.g. at https://docs.openstack.org/openstack-ansible-os_magnum/latest/

Can it be added? I don't know where else this should be updated, but perhaps someone more familiar with the breadth of the documentation could add it in those places too.

-----------------------------------
Release: on 2021-02-16 18:04:49
SHA: 001d60e254923fc4e860eb1544587c18dacbf23f
Source: https://opendev.org/openstack/openstack-manuals/src/doc/install-guide/source/firewalls-default-ports.rst
URL: https://docs.openstack.org/install-guide/firewalls-default-ports.html

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/openstack-manuals/+/785911
Committed: https://opendev.org/openstack/openstack-manuals/commit/b4a76b229ce5156c35f0cf8b6a55c89f61e16bbe
Submitter: "Zuul (22348)"
Branch: master

commit b4a76b229ce5156c35f0cf8b6a55c89f61e16bbe
Author: Dmitriy Rabotyagov <email address hidden>
Date: Mon Apr 12 18:54:01 2021 +0300

    Update service ports table

    Table has not been maintained for a while and needed adjustments in
    terms of the available services along with used ports.

    Table was made on best effort basis, which means that only most known
    services were filled in and some might be still missing.

    Closes-Bug: #1915979
    Change-Id: Icca93386f7c52c22472892f6e82fb82744c54832