fix flag name in SetAnnotation

Author: dmitris

cmd/cosign/cli/options/certificate.go

@@ -79,7 +79,7 @@ func (o *CertVerifyOptions) AddFlags(cmd *cobra.Command) {
 	cmd.Flags().StringVar(&o.CARoots, "ca-roots", "",
 		"path to a bundle file of CA certificates in PEM format which will be needed "+
 			"when building the certificate chains for the signing certificate. Conflicts with --certificate-chain.")
-	_ = cmd.Flags().SetAnnotation("certificate-bundle", cobra.BashCompFilenameExt, []string{"cert"})
+	_ = cmd.Flags().SetAnnotation("ca-roots", cobra.BashCompFilenameExt, []string{"cert"})
 
 	cmd.Flags().StringVar(&o.CertChain, "certificate-chain", "",
 		"path to a list of CA certificates in PEM format which will be needed "+