Dan Castillo

docs: updated fastify-session-authentication readme

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fixes fastify/example#25 - [x] documentation is changed or added - [x] commit message and code follows the [Developer's Certification of Origin](https://github.com/fastify/.github/blob/master/CONTRIBUTING.md#developers-certificate-of-origin-11) and the [Code of conduct](https://github.com/fastify/.github/blob/master/CODE_OF_CONDUCT.md)

Turn `useSemicolonDefault` default option to false. > Can we roll this into v5 as a breaking change and keep it disabled and non-configurable? > > From reading the spec linked...

feat: move router options to own key

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#### Checklist closes: https://github.com/fastify/fastify/issues/3809 - [x] run `npm run test` and `npm run benchmark` - [x] tests and/or benchmarks are included - [x] documentation is changed or added - [x]...