Micronaut Validation documentation incorrect statement about @Introspected

### Expected Behavior

Validation documentation shouldn't state that @Introspected annotation is required for validation.

### Actual Behaviour

Current Micronaut Validation documentation (https://micronaut-projects.github.io/micronaut-validation/snapshot/guide/) states that:

To validate data classes, e.g. POJOs (typically used in JSON interchange), the class **must be** annotated with [@Introspected](https://docs.micronaut.io/latest/api/io/micronaut/core/annotation/Introspected) (see [Micronaut Guide Introspection section](https://docs.micronaut.io/latest/guide/#introspection)) or, if the class is external, be imported by the @Introspected annotation.

However that's not true as per Micronaut 4.1.4.

So here's our POJO:

```
public class Product {

@NotEmpty
private String name;

private int id;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}
}
```

And our configuration class:

```
@SerdeImport(Product.class)
public class BeanValidationConfiguration {
}

```
So there's no @Introspected here (@SerdeImport is meta-annotation but doesn't contain it) however Jakarta Validation works which was confirmed by our tests.

### Steps To Reproduce

_No response_

### Environment Information

_No response_

### Example Application

_No response_

### Version

4.1.4

Start with the validation documentation at https://micronaut-projects.github.io/micronaut-validation/snapshot/guide/ and locate the statement that @Introspected is required for validating data classes. Update the wording to reflect the reported @SerdeImport example, then verify that the documentation no longer makes the incorrect requirement claim.

Written by the indexing model from the issue text.