Docs: Dev Tunnels "Configure dev tunnel options" examples do not compile; options table omits Region

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### Page

[`integrations/devtools/dev-tunnels`](https://aspire.dev/integrations/devtools/dev-tunnels/) → "Configure dev tunnel options" and "Configuration → Dev tunnel options".

Source: [`dev-tunnels.mdx`](https://github.com/microsoft/aspire.dev/blob/release/13.5/src/frontend/src/content/docs/integrations/devtools/dev-tunnels.mdx)

### Problem 1 — C# example does not compile

```csharp
var options = new DevTunnelOptions
{
TunnelId = "my-tunnel-id", // not a DevTunnelOptions member
Description = "QA environment tunnel",
Labels = new[] { "qa", "testing" }, // string[] not assignable to List?
AllowAnonymous = false
};

var tunnel = builder.AddDevTunnel("qa", options) // options bound to `string? tunnelId`
.WithReference(web);
```

Verified against [`DevTunnelOptions.cs`](https://github.com/microsoft/aspire/blob/release/13.5/src/Aspire.Hosting.DevTunnels/DevTunnelOptions.cs) — the members are `Description`, `AllowAnonymous`, `Labels` (`List?`), and `Region`; there is **no `TunnelId`** — and [`DevTunnelResourceBuilderExtensions.cs`](https://github.com/microsoft/aspire/blob/release/13.5/src/Aspire.Hosting.DevTunnels/DevTunnelResourceBuilderExtensions.cs) — `AddDevTunnel(string name, string? tunnelId = null, DevTunnelOptions? options = null)`.

Three issues:

1. `TunnelId` is not a member of `DevTunnelOptions`. It is a **parameter** of `AddDevTunnel` (and a property of `DevTunnelResource`).
2. `Labels = new[] { "qa", "testing" }` assigns a `string[]` to a `List?` property, which does not compile.
3. `builder.AddDevTunnel("qa", options)` passes a `DevTunnelOptions` into the `string? tunnelId` positional parameter.

**Correct:**

```csharp
var options = new DevTunnelOptions
{
Description = "QA environment tunnel",
Labels = ["qa", "testing"],
AllowAnonymous = false
};

var tunnel = builder.AddDevTunnel("qa", tunnelId: "my-tunnel-id", options: options)
.WithReference(web);
```

### Problem 2 — TypeScript example passes an options object the export does not accept

The exported polyglot API is `addDevTunnel(name, tunnelId?, allowAnonymous?, description?, labels?)` — from `AddDevTunnelForPolyglot`, annotated `[AspireExport("addDevTunnel")]` in `DevTunnelResourceBuilderExtensions.cs`. It takes positional parameters, **not** a `{ tunnelId, description, labels, allowAnonymous }` object. The documented TypeScript call:

```typescript
const tunnel = await builder.addDevTunnel("qa", {
tunnelId: "my-tunnel-id",
description: "QA environment tunnel",
labels: ["qa", "testing"],
allowAnonymous: false,
}).withReference(web);
```

does not match the exported signature (and `tunnelId` is not a nested option in either language).

### Problem 3 — options table omits `Region`

The "Dev tunnel options" table lists only `Description`, `Labels`, and `AllowAnonymous`, but `DevTunnelOptions` also exposes **`Region`** (`DevTunnelRegion?`, an enum of ~13 regions). Note that the exported TypeScript `addDevTunnel` does **not** surface `Region`, so if the table documents `Region`, it should note the C#-only scope.

### Provenance

aspire.dev `release/13.5` (`dev-tunnels.mdx`); aspire `release/13.5` (`DevTunnelOptions.cs`, `DevTunnelResourceBuilderExtensions.cs`). Compile behavior confirmed against the 13.5 candidate.

Start with src/frontend/src/content/docs/integrations/devtools/dev-tunnels.mdx and compare its examples with DevTunnelOptions.cs and DevTunnelResourceBuilderExtensions.cs. Update the C# and TypeScript examples to match their documented signatures, and add Region to the options table with its C#-only scope. Done means the examples match the 13.5 APIs and the table covers the available options.

Written by the indexing model from the issue text.