docs: add link to dotnet sdk

Add link to the install instructions for the dotnet SDK. Note that, due to
installation instructions differing based on the distro and version users
are running, the best we are able to do is link to the page that provides
further links for users to follow to use their respective package managers
to install.

docs/install.md

@@ -205,8 +205,10 @@ the preferred install method for Linux because you can use it to install on any
 distribution][dotnet-supported-distributions]. You
 can also use this method on macOS or Windows if you so choose.
 
-**Note:** Make sure you have installed the .NET SDK before attempting to run the
-following `dotnet tool` commands.
+**Note:** Make sure you have installed [version 6.0 of the .NET
+SDK][dotnet-install] before attempting to run the following `dotnet tool`
+commands. After installing, you will also need to follow the output instructions
+to add the tools directory to your `PATH`.
 
 #### Install
 
@@ -228,6 +230,7 @@ git-credential-manager unconfigure
 dotnet tool uninstall -g git-credential-manager
 ```
 
+[dotnet-install]: https://learn.microsoft.com/en-us/dotnet/core/install/linux#packages
 [dotnet-supported-distributions]: https://learn.microsoft.com/en-us/dotnet/core/install/linux
 [dotnet-tool]: https://learn.microsoft.com/en-us/dotnet/core/tools/global-tools
 [gcm-credstores]: credstores.md