az network vnet: Remove unsupported summarized-gateway-prefixes + ipam-pool-prefix-allocations example from docs

[Copilot]

Related command
az network vnet create, az network vnet update

Description
The help docs for az network vnet create/update included an example combining --summarized-gateway-prefixes with ipam-pool-prefix-allocations, but this combination is not supported by the service. This misled users into hitting errors when following the documented example.

• Removed the --summarized-gateway-prefixes + ipam-pool-prefix-allocations example from the Create command docstring (_create.py).
• Removed the same misleading example from the Update command docstring (_update.py).
• Retained the valid --summarized-gateway-prefixes with address-prefixes example in both commands.

Testing Guide

az network vnet create --resource-group rg1 --name test-vnet --location eastus --address-prefixes 10.0.0.0/16 --summarized-gateway-prefixes address-prefixes="[10.0.0.0/16]"
az network vnet create --help

Confirm the help text no longer shows the ipam-pool-prefix-allocations example under --summarized-gateway-prefixes.

History Notes
[Network] az network vnet create/update: Remove unsupported --summarized-gateway-prefixes with ipam-pool-prefix-allocations example from help docs

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• Fixes Update summarized-gateway-prefixes property for Virtual Network docs #33923

[azure-client-tools-bot-prd]

Hi Copilot,
Since the current milestone time is less than 7 days, this pr may not catch up with this release.

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[Copilot]

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[azure-pipelines]

Azure Pipelines:
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[azure-client-tools-agent]

Live test skipped

⏭️ Skipping the live test for this revision because no new test file was added (tests/**/test_*.py).

The live-test pipeline runs only the test files a PR changes, so there is nothing to execute for this commit. This is informational — a regression test is encouraged where it makes sense, but not required. If a test file is added in a later commit, the live test will run automatically.

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Posted by agent-assist (autonomous bug-fix pipeline).

[Yong Zhang (yonzhan)]

network

[microsoft-github-policy-service]

🔔 Routing this PR to @Azure/act-quality-productivity-squad.

[azure-client-tools-agent]

CI Summary — Review Requested

This PR has completed CI with 1 failing check out of 102 total checks. No live-test dispatch was needed (no tests/**/test_*.py files changed).

Failed check:

• Azure.azure-cli — Build #20260818.24 failed with 8 errors / 0 warnings. See build details: https://dev.azure.com/azclitools/5147fa83-336e-44ef-bbe0-c86b8ae86cbb/_build/results?buildId=339246
• Check run: https://github.com/Azure/azure-cli/runs/95868783893

Please review the pipeline failure and address the reported errors before this PR can be merged.

[Ethan Yang (necusjz)]

resolved by #33930.