docs: Update GCS signing key documentation
This key is now taken straight from the configured service account key.
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		|  | @ -85,15 +85,15 @@ You may set *all* of these: | |||
| 
 | ||||
| * `NIX_TIMEOUT`: Number of seconds that any Nix builder is allowed to run | ||||
|   (defaults to 60) | ||||
| * `GCS_SIGNING_KEY`: A Google service account key (in PEM format) that can be | ||||
|   used to [sign Cloud Storage URLs][signed-urls] | ||||
| * `GCS_SIGNING_ACCOUNT`: Google service account ID that the signing key belongs | ||||
|   to | ||||
| 
 | ||||
| To authenticate to the configured GCS bucket, Nixery uses Google's [Application | ||||
| Default Credentials][ADC]. Depending on your environment this may require | ||||
| additional configuration. | ||||
| 
 | ||||
| If the `GOOGLE_APPLICATION_CREDENTIALS` environment is configured, the service | ||||
| account's private key will be used to create [signed URLs for | ||||
| layers][signed-urls]. | ||||
| 
 | ||||
| ## 4. Deploy Nixery | ||||
| 
 | ||||
| With the above environment variables configured, you can run the image that was | ||||
|  |  | |||
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