Update instructions for verifying against staging (#315)

Root moved to a different repo

Signed-off-by: Hayden B <[email protected]>

content/en/system_config/public_deployment.md

@@ -28,15 +28,14 @@ These instances are operated and maintained in the same manner as the public pro
 To use this instance, follow the steps below:
 
 1. `rm -r ~/.sigstore`
-1. `curl -O https://raw.githubusercontent.com/sigstore/root-signing/main/staging/repository/1.root.json`
+1. `curl -O https://raw.githubusercontent.com/sigstore/root-signing-staging/main/metadata/root_history/1.root.json`
 1. `cosign initialize --mirror=https://tuf-repo-cdn.sigstage.dev --root=1.root.json`
 1. `cosign sign --oidc-issuer "https://oauth2.sigstage.dev/auth" --fulcio-url "https://fulcio.sigstage.dev" --rekor-url "https://rekor.sigstage.dev" ${IMAGE_DIGEST}`
-1. `cosign verify --rekor-url "https://rekor.sigstage.dev" ${IMAGE}` --certificate-identity=[email protected]
-                                                                     --certificate-oidc-issuer=https://accounts.example.com
+1. `cosign verify --rekor-url "https://rekor.sigstage.dev" ${IMAGE} --certificate-identity=[email protected] --certificate-oidc-issuer=https://accounts.example.com
 
-* Steps 1-4 configure your local environment to use the staging keys and certificates.
-* Step 5 specifies the staging environment with flags needed for signing.
-* Step 6 specifies the staging environment with flags needed for verifying.
+* Steps 1-3 configure your local environment to use the staging keys and certificates.
+* Step 4 specifies the staging environment with flags needed for signing.
+* Step 5 specifies the staging environment with flags needed for verifying.
 
 #### Revert Back to Production