_cli: Amend --certificate-chain description

Signed-off-by: Alex Cameron <asc@tetsuo.sh>

Author: tetsuo-cpp

README.md

@@ -178,9 +178,7 @@ Extended verification options:
   --certificate-chain FILE
                         Path to a list of CA certificates in PEM format which
                         will be needed when building the certificate chain for
-                        the signing certificate; must start with the parent
-                        intermediate CA certificate of the signing certificate
-                        and end with the root certificate (default: None)
+                        the signing certificate (default: None)
   --cert-email EMAIL    Deprecated; causes an error. Use --cert-identity
                         instead (default: None)
   --cert-identity IDENTITY

sigstore/_cli.py

@@ -281,9 +281,7 @@ def _parser() -> argparse.ArgumentParser:
         type=argparse.FileType("rb"),
         help=(
             "Path to a list of CA certificates in PEM format which will be needed when building "
-            "the certificate chain for the signing certificate; must start with the parent "
-            "intermediate CA certificate of the signing certificate and end with the root "
-            "certificate"
+            "the certificate chain for the signing certificate"
         ),
     )
     verification_options.add_argument(