dotnet-dsrouter and dotnet-gcdump doc needed when default port is occupied

*Edit: This doc request is for .net 8+, where the runtime and diagnostics added dotnet-gcdump support for mobile devices.

dotnet-dsrouter add some useful command to make mobile device interaction more conveniently, such as the `dotnet-dsrouter android` command.

The instructions provided by current document works fine when the default ip address is free, (checking the source code, it is 127.0.0.1:9000 by default), but there will be cases that port 9000 is occupied by other process, such as firm-wise internal security application, which one is not able or hard to alter.

Under such scenario, when working with dotnet-gcdump, the dotnet-dsrouter setup instructions provided with dotnet-dsrouter, dotnet-gcdump are not working.

By browsing the source code of dotnet-dsrouter and manual testing, the actually working dotnet-dsrouter config (manually checked with android device) is `dotnet-dsrouter server-server -tcps 127.0.0.1:{port} -fp Android`, with no ipcs option. If ipcs option added, dotnet-gcdump will not be able to collect the gcdump from mobile device, but only the dotnet-dsrouter's.

I only checked the work-around with android device though.

Please verify the work-around and consider add documentation for such scenario.