Contributing guidelines for dotnet tools for ruby won't install on Ubuntu 24.04

[luke-hill]

🤔 What's the problem you've observed?

[10:46:14] luke@luke-VirtualBox:~/Code/gherkin/ruby$ sudo apt-get install dotnet-host-8.0
[sudo] password for luke: 
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following NEW packages will be installed:
  dotnet-host-8.0
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 185 kB of archives.
After this operation, 525 kB of additional disk space will be used.
Get:1 http://gb.archive.ubuntu.com/ubuntu noble-updates/main amd64 dotnet-host-8.0 amd64 8.0.7-0ubuntu1~24.04.1 [185 kB]
Fetched 185 kB in 0s (855 kB/s)         
Selecting previously unselected package dotnet-host-8.0.
(Reading database ... 229309 files and directories currently installed.)
Preparing to unpack .../dotnet-host-8.0_8.0.7-0ubuntu1~24.04.1_amd64.deb ...
Unpacking dotnet-host-8.0 (8.0.7-0ubuntu1~24.04.1) ...
Setting up dotnet-host-8.0 (8.0.7-0ubuntu1~24.04.1) ...
Processing triggers for man-db (2.12.0-4build2) ...
[10:46:36] luke@luke-VirtualBox:~/Code/gherkin/ruby$ dotnet tool update Berp --version 1.3.0 --tool-path /usr/bin
Error: [/usr/lib/dotnet/host/fxr] does not exist

✨ Do you have a proposal for making it better?

Maybe we need to revisit the installation tips @gasparnagy

📚 Any additional context?

No response

[luke-hill]

Have refactored this in the PR. Fixed on #266