Missing information in codelabs page 2 for windows machines

[LukeRenton]

I believe there to be a lack of information in page 2 (https://codelabs.developers.google.com/add-to-wallet-web#1) of the code labs under the title Create a service key account when it comes to verifying if the environment variable GOOGLE_APPLICATION_CREDENTIALS is set on windows machines.

It says: "Verify the environment variable is set in a new terminal (MacOS/Linux) or command-line (Windows) session (you may need to start a new session if you have one open already)"
echo $GOOGLE_APPLICATION_CREDENTIALS

On windows this command is incorrect for properly displaying the contents for the environment variable GOOGLE_APPLICATION_CREDENTIALS

As seen here (in PowerShell run as admin):

> $env:GOOGLE_APPLICATION_CREDENTIALS="C:\Users\user\Downloads\file-name-goes-here.json"

---- new terminal session

> echo $GOOGLE_APPLICATION_CREDENTIALS
> (blank)

The correct command would be as follows for Windows PowerShell:

> $env:GOOGLE_APPLICATION_CREDENTIALS="C:\Users\user\Downloads\file-name-goes-here.json"

--- (new terminal session)

> echo $env:GOOGLE_APPLICATION_CREDENTIALS`
> C:\Users\user\Downloads\file-name-goes-here.json`

As required.

The display command for Command Prompt is also different:

> echo %GOOGLE_APPLICATION_CREDENTIALS%
> C:\Users\user\Downloads\file-name-goes-here.json

I know this is something small, but I think it will help future developers (on windows) follow along better.