Update configmap about adding custom locations

[kevinsimper]

I tried using server-snippet and location-snippet to add a custom location, like this in 0.24.1:

  location-snippet: |
    allow 20.0.0.0/8;
    deny all;

    location /status {
        allow 100.0.0.0/8;
        deny all;

        set $proxy_upstream_name "{{ buildUpstreamName $server.Hostname $all.Backends $location $all.DynamicConfigurationEnabled }}";
        proxy_pass http://upstream_balancer;
    }

but that didn't work, I got 503, and I tried copying in the exact location, but then the nginx configuration doesn't load, and the last solution was to make my own nginx.tmpl and that worked.

It looks like others also have experienced the same and this feature has stopped working: #4084 (comment)

It would be cool if you could avoid having to inherit the whole nginx.tmpl., but it is not bad, but it is just a bit of inconvenience to have to try the whole ordeal by providing your small customization with a location snippet and then debugging 😃

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[aledbf]

/ok-to-test

[aledbf]

/lgtm
/approve

[aledbf]

@kevinsimper thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, kevinsimper

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[aledbf]

/retest

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