Drop confused warning about secret

[pftg]

In GitHub, there are secrets and env entities, and sharing that this action requires a secret is misleading.

[satterly]

Accessing your secrets
To make a secret available to an action, you must set the secret as an input or environment variable in the workflow file. Review the action's README file to learn about which inputs and environment variables the action expects.

https://docs.github.com/en/actions/security-guides/encrypted-secrets

[satterly]

👍