Add @ symbol support to existing .NET CLI command documentation.

[marcpopMSFT]

Describe the issue or suggestion

We added support for the @ format for the dotnet workload search and install commands and dotnet new install command in 9.0.2xx and for dotnet tool install and update commands in 10.0.1xx. The existing documents for these commands should get updated to match. https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-workload-install https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-workload-search

• https://github.com/dotnet/sdk/pull/45156

https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-new-install

• https://github.com/dotnet/sdk/pull/45545

https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-tool-install https://learn.microsoft.com/en-us/dotnet/core/tools/dotnet-tool-update

• https://github.com/dotnet/sdk/pull/48085

[marcpopMSFT]

CC @dsplaisted @baronfel