[ Variables ] - Add missing documentation for repository variables #7
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As seen in this issue the support for variables was made months ago, but the documentation does not have this information
Why update this: at least for me, the only way to discover this functionality existed was searching and finding the mentioned issue above
Reference for the updated section:
![image](https://private-user-images.githubusercontent.com/65742620/271688404-2f6a6a1c-0241-4ef7-bf10-09657041aa4e.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.yadcWzg9_VJwZtRfYqzQDnfCRrM2S4dDulUMf30aFyU)