[Doctrine] price property is an integer and a float

[alexislefebvre]

On 4.0+ documentation, an entity is created and its price property is an integer:

    /**
     * @ORM\Column(type="integer")
     */
    private $price;

A note explain this:

Confused why the price is an integer? Don't worry: this is just an example. But, storing prices as integers (e.g. 100 = $1 USD) can avoid rounding issues.

But when the entity is persisted a float number is provided:

        $product->setPrice(19.99);

I think that this is inconsistent.

---

It's related to #9487.

I can provide a PR.

[javiereguiluz]

Fixed by #9680.