Secrets example in Managing complex workflows doesn't work as expected

[gsrohde]

What article on docs.github.com is affected?

https://docs.github.com/en/free-pro-team@latest/actions/learn-github-actions/managing-complex-workflows#storing-secrets

What part(s) of the article would you like to see updated?

The Storing secrets example uses different cases for storing and for using the defined environment variable and so doesn't work as expected.

Additional information

I am making a pull request to address the issue (#762).

[welcome]

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