Unclear what I can achieve with 'az devops service-endpoint update'

I'm looking for a way to update the service principal password my existing service connection to Azure RM.
I thought `az devops service-endpoint update` could perhaps help me out, but I don't see how.

Is the _only_ thing you can do with `az devops service-endpoint update` is toggle `enable-for-all` ? Is it not possible to update the `--service-endpoint-configuration` property ( in the `create` command ) ? I have a hard time believing that so is something missing from the documentation or am I misunderstanding something?

So would it be possible to do `az devops service-endpoint update --service-endpoint-configuration "json-stuff-here"]` ?
Or - perhaps even nicer: `az devops service-endpoint update --set authorization.parameters.password=password123` like you can do with [az network firewall update](https://docs.microsoft.com/en-us/cli/azure/ext/azure-firewall/network/firewall?view=azure-cli-latest#ext_azure_firewall_az_network_firewall_update) for instance.

---
#### Document Details

⚠ *Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.*

* ID: 6ecb62a2-f74c-a539-d3a8-c8fde7c2de06
* Version Independent ID: 5760936e-90a1-4129-6f6f-6dd4194bb73c
* Content: [az devops service-endpoint](https://docs.microsoft.com/en-us/cli/azure/ext/azure-devops/devops/service-endpoint?view=azure-cli-latest#ext_azure_devops_az_devops_service_endpoint_create)
* Content Source: [latest/docs-ref-autogen/ext/azure-devops/devops/service-endpoint.yml](https://github.com/MicrosoftDocs/azure-docs-cli/blob/master/latest/docs-ref-autogen/ext/azure-devops/devops/service-endpoint.yml)
* GitHub Login: @rloutlaw
* Microsoft Alias: **routlaw**

Start with latest/docs-ref-autogen/ext/azure-devops/devops/service-endpoint.yml and the az devops service-endpoint update entry point referenced in the issue. Compare the documented update options with the create command's service-endpoint-configuration behavior, then establish whether the requested credential update is supported and what documentation or command change would define completion.

Written by the indexing model from the issue text.