Update Inertia middleware example

[afgallo]

This PR updates the Inertia middleware example in the AdonisJS documentation: https://docs.adonisjs.com/guides/views-and-templates/inertia#share-from-a-middleware

[RomainLanz]

Hey @afgallo! 👋🏻

What's wrong with the current middleware?

[afgallo]

Hey @afgallo! 👋🏻

What's wrong with the current middleware?

Hey @RomainLanz,

I guess there is nothing wrong with the middleware itself, the documentation doesn't reflect the method signature which is what I've updated in the docs with this PR 👍🏻

[RomainLanz]

Oh yeah, the signature is wrong. It has to be an object. I have changed the example a bit to be less verbose and more accurate than the previous one.

[RomainLanz]

Thanks!