Update edge-runtime.md

[zanechua]

console.log does not currently print all the environment variables that the edge runtime should have access to. I am assuming that this is a technical challenge or it only accesses the variables it needs if they are declared. This can be confusing when trying to implement as you would make the assumption that printing process.env should display all accessible environment variable.

Bug

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• Integration tests added
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Feature

• Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
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• Integration tests added
• Documentation added
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Documentation / Examples

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[balazsorban44]

Thanks!