improvements to heroku log drain

[Vadman97]

Summary

• Fixes documentation for heroku log drain
• Fixes implementation for matching heroku log drain token -> project ID.

Testing the heroku log drain implementation locally was impossible given valid TLS termination for a local endpoint was necessary, and even ngrok with TLS mode seemed to be garbling the data.

How did you test this change?

docs preview

Are there any deployment considerations?

no

Does this work require review from our design team?

no

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Latest commit: bcb27b5

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[ccschmitz]