docs: Update use of glob patterns in docs in README.md

[vedraan]

Description

The docs assume that routes will always be in a subfolder of express app which may not be true and in which case the docs could use a touchup.

E.g. in a hexagonal architecture, Express is considered an adapter and api routes are ports so you may need something like:

useExpressServer(this.app, {
  routePrefix: '/api',
  controllers: [path.join(__dirname, '../../ports/api/routes/**/*.*')],
});

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (develop)
• the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated
• I have run the project locally and verified that there are no errors

[github-actions]

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