Fix template installation command for fish shell

[Bargsteen]

Summary

The installation command did not work for me in the fish shell on macOS. Adding the quotes fixed it.

I made the change using GitHub which unfortunately also applied some formatting or similar to an unrelated section.

Fixes

Before:

dotnet new install Expecto.Template::*
fish: No matches for wildcard 'Expecto.Template::*'. See `help wildcards-globbing`.
dotnet new install Expecto.Template::*
                   ^~~~~~~~~~~~~~~~~~^

After:

dotnet new install "Expecto.Template::*"
The following template packages will be installed:
   Expecto.Template::*
...