message: Fix a file path and a syntax error
  This file path seems outdated, or a typo. This syntax error is certainly a typo.
diff: @@ -41,7 +41,7 @@ besides the config section above, it also needs to be given one or more
  callbacks in actual code as well as described below.
  Add a `providerFactories` entry to the router in
  -`packages/backend/plugin/auth.ts`.
  +`packages/backend/src/plugins/auth.ts`.
  ```ts
  import { providers } from '@backstage/plugin-auth-backend';
  @@ -75,7 +75,10 @@ export default async function createPlugin(
  // GSuite or similar, based on the IAP token sub/email claims
  const id = iapToken.email.split('@')[0];
  const sub = stringifyEntityRef({ kind: 'User', name: id });
  - const ent = [sub, stringifyEntityRef({ kind: 'Group', name: 'team-name' });
  + const ent = [
  + sub,
  + stringifyEntityRef({ kind: 'Group', name: 'team-name' }),
  + ];
  return ctx.issueToken({ claims: { sub, ent } });
  },
  },
  