dotnet new install --help incorrectly suggests :: instead of @ for version

### Describe the bug

This is the text from `dotnet new install -?`:

This is the text when using this syntax:

The help text should be updated to say to use `@` instead of `::`.

### Further technical details
details of dotnet --info

.NET SDK:

 Version:           10.0.201

 Commit:            4d3023de60

 Workload version:  10.0.200-manifests.121cc9e6

 MSBuild version:   18.3.0-release-26153-122+4d3023de6


Runtime Environment:

 OS Name:     Windows

 OS Version:  10.0.26200

 OS Platform: Windows

 RID:         win-x64

 Base Path:   C:\Program Files\dotnet\sdk\10.0.201\

.NET workloads installed:

There are no installed workloads to display.

Configured to use workload sets when installing new manifests.

No workload sets are installed. Run "dotnet workload restore" to install a workload set.

Host:

  Version:      10.0.5

  Architecture: x64

  Commit:       a612c2a105

.NET SDKs installed:

  8.0.419 [C:\Program Files\dotnet\sdk]

  9.0.312 [C:\Program Files\dotnet\sdk]

  10.0.201 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:

  Microsoft.AspNetCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]

  Microsoft.AspNetCore.App 8.0.25 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]

  Microsoft.AspNetCore.App 9.0.14 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]

  Microsoft.AspNetCore.App 10.0.5 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]

  Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

  Microsoft.NETCore.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

  Microsoft.NETCore.App 8.0.25 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

  Microsoft.NETCore.App 9.0.14 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

  Microsoft.NETCore.App 10.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]

  Microsoft.WindowsDesktop.App 6.0.36 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

  Microsoft.WindowsDesktop.App 8.0.25 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

  Microsoft.WindowsDesktop.App 9.0.14 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

  Microsoft.WindowsDesktop.App 10.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:

  x86   [C:\Program Files (x86)\dotnet]

    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:

  DOTNET_CLI_TELEMETRY_OPTOUT              [1]

  DOTNET_SKIP_FIRST_TIME_EXPERIENCE        [1]

global.json file:

  C:\Dev\repro\empty\global.json

Learn more:

  https://aka.ms/dotnet/info

Download .NET:

  https://aka.ms/dotnet/download