docs: Fix mistake in setup docs

README.md

@@ -83,7 +83,7 @@ and the [About](patches/build.gradle.kts#L5-L11))
 4. [Create a pass-phrased GPG master key and subkey](https://mikeross.xyz/create-gpg-key-pair-with-subkeys/)
    1. Add the private key as a secret named [GPG_PRIVATE_KEY](.github/workflows/release.yml#L52) to your repository
    2. Add the passphrase as a secret named [GPG_PASSPHRASE](.github/workflows/release.yml#L53) to your repository
-   3. Add the fingerprint of the GPG subkey as a secret named [GPG_FINGERPRINT](.github/workflows/release.yml#L54) to your repository
+   3. Add the fingerprint of the GPG subkey as a variable named [GPG_FINGERPRINT](.github/workflows/release.yml#L54) to your repository
 5. Set up the [README.md](README.md) file[^1] (e.g, title, description, license, summary of the patches
 that are included in the repository), the [issue templates](.github/ISSUE_TEMPLATE)[^2]  and the [contribution guidelines](CONTRIBUTING.md)[^3]