message: change private single quotes to backticks
diff: @@ -197,7 +197,7 @@ impl Manifest {
  }
  fn check_private(&self, environment: Option<&Environment>) {
  - let deprecate_private_warning = "The 'private' field is deprecated; please use \
  + let deprecate_private_warning = "The `private` field is deprecated; please use \
  `workers_dot_dev` to toggle between publishing to your workers.dev subdomain and your own domain.";
  // Check for the presence of the 'private' field in top-level config; if present, warn.
  