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

---

This checklist is used to make sure that common guidelines for a pull request are followed.

• The PR title and description has followed the guideline in Submitting Pull Requests.

• I adhere to the Command Guidelines.

• I adhere to the Error Handling Guidelines.

• 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.

[azure-pipelines]

Azure Pipelines:
There may be pipelines that require an authorized user to comment /azp run to run.

[Copilot]

Copilot wasn't able to review any files in this pull request.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[azure-pipelines]

Azure Pipelines:
There may be pipelines that require an authorized user to comment /azp run to run.

[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.

---

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

[microsoft-github-policy-service]

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

[Yong Zhang (yonzhan)]

network