README.md inappropriately references functions as asynchronous when they are in fact all synchronous with inline callback support

Inizia in README.md, nella documentazione di jwt.verify(), e cerca altre descrizioni dell’API che definiscono asincrone le funzioni basate su callback. Aggiorna la terminologia per riflettere il comportamento dei callback inline, mantenendo le indicazioni d’uso esistenti, quindi rivedi tutte le sezioni interessate di README.md per garantire una formulazione coerente.

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Description

In multiple places in the README.md file it lists the API functions as both synchronous and asynchronous depending on the input parameters for the function. For example, the verify() operation:
Link to doc

(Asynchronous) If a callback is supplied, function acts asynchronously. The callback is called with the decoded payload if the signature is valid and optional expiration, audience, or issuer are valid. If not, it will be called with the error.

(Synchronous) If a callback is not supplied, function acts synchronously. Returns the payload decoded if the signature is valid and optional expiration, audience, or issuer are valid. If not, it will throw the error.

In reality, the function is synchronous and when a callback is provided, it is still behaves as a synchronous callback. The callback is invoked inline.

The term Asynchronous should be reserved for methods that utilize the Promise contract and the async keyword.

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