…vitorino)

This PR was submitted for the master branch but it was merged into the 3.4 branch instead (closes #12416).

Discussion
----------

Make clear when the options are effectively required

In the documentation related to the `Count` constraint is not clear that the parameters `min` and `max` are dependent on each other to determine if they are required.

This is an snipped taken from `\Symfony\Component\Validator\Constraints\Count` in package `symfony/validator` version 4.3.4 that states this dependency:
```
if (null === $this->min && null === $this->max) {
            throw new MissingOptionsException(sprintf('Either option "min" or "max" must be given for constraint %s', __CLASS__), ['min', 'max']);
        }
```

Commits
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8534533 Make clear when the options are effectively required

… not required simultaneously (ohvitorino)

This PR was merged into the 3.4 branch.

Discussion
----------

[Validator] Options `min` and `max` of Length constraint not required simultaneously

As for the Count validator constraint (see: #12416]) the options `min` and `max` of the Length constraint are not required simultaneously.

Commits
-------

0f22305 Make clear when the options min and max are required