minor #14847 [Uid] getId(): ?Uuid missing // need test getId: ?Ulid (Mausino)

This PR was merged into the 5.2 branch.

Discussion
----------

[Uid] getId(): ?Uuid missing // need test getId: ?Ulid

I added all code as in example, but i had still issue with api-platform that getId() field is wrong defined...
I have no experience with ULID !!! Please test my solution for

This solved my issue.. and now i am able create, update or delete record without any other issues.
I think that this will save lot of time for new users... because fist i thinked that must be

```php
    public function getId(): ?UuidV4Generator
    {
        return $this->id;
    }
```

but with this my code was still broken...  now i know that there must be if you change primary identifier from Int to Uuid

```php
use Symfony\Component\Uid\Uuid;
public function getId(): ?Uuid
        {
            return $this->id;
        }
```

....
also i think need to done the section of Uuid and Ulid for  private $someProperty; getter and setter

Commits
-------

b11628a getId(): ?Uuid missing // need test getId: ?Ulid

Author: javiereguiluz

components/uid.rst

@@ -141,6 +141,7 @@ entity primary keys::
 
     // there are generators for UUID V1 and V6 too
     use Symfony\Bridge\Doctrine\IdGenerator\UuidV4Generator;
+    use Symfony\Component\Uid\Uuid;
 
     /**
      * @ORM\Entity(repositoryClass="App\Repository\ProductRepository")
@@ -156,6 +157,13 @@ entity primary keys::
         private $id;
 
         // ...
+        
+        public function getId(): ?Uuid
+        {
+            return $this->id;
+        }
+        
+        // ...
     }
 
 .. versionadded:: 5.2
@@ -279,6 +287,7 @@ There's also a Doctrine generator to help autogenerate ULID values for the
 entity primary keys::
 
     use Symfony\Bridge\Doctrine\IdGenerator\UlidGenerator;
+    use Symfony\Component\Uid\Ulid;    
 
     /**
      * @ORM\Entity(repositoryClass="App\Repository\ProductRepository")
@@ -294,6 +303,14 @@ entity primary keys::
         private $id;
 
         // ...
+        
+        public function getId(): ?Ulid
+        {
+            return $this->id;
+        }
+        
+        // ...
+        
     }
 
 .. versionadded:: 5.2