Apply suggestions from code review

Co-authored-by: Alexander M. Turek <me@derrabus.de>

Author: greg0ire

docs/en/cookbook/decorator-pattern.rst

@@ -167,14 +167,14 @@ of the getSpecial() method to its return value.
     {
 
         #[Column(type: 'string', nullable: true)]
-        protected $special;
+        protected string|null $special = null;
 
-        public function setSpecial(string $special): void
+        public function setSpecial(string|null $special): void
         {
             $this->special = $special;
         }
 
-        public function getSpecial(): string
+        public function getSpecial(): string|null
         {
             return $this->special;
         }

docs/en/tutorials/composite-primary-keys.rst

@@ -33,9 +33,9 @@ and year of production as primary keys:
         {
             public function __construct(
                 #[Id, Column(type: 'string')]
-                string $name,
+                private string $name,
                 #[Id, Column(type: 'integer')]
-                int $year,
+                private int $year,
             ) {
             }
 
@@ -235,14 +235,14 @@ One good example for this is a user-address relationship:
         class User
         {
             #[Id, Column(type: 'integer'), GeneratedValue]
-            private $id;
+            private int|null $id = null;
         }
 
         #[Entity]
         class Address
         {
             #[Id, OneToOne(targetEntity: User::class)]
-            private $user;
+            private User|null $user = null;
         }
 
     .. code-block:: yaml
@@ -299,9 +299,10 @@ of products purchased and maybe even the current price.
         #[Column(type: 'datetime')]
         private DateTime $created;
 
-        public function __construct(Customer $customer)
-        {
-            $this->customer = $customer;
+        public function __construct(
+            #[ManyToOne(targetEntity: Customer::class)]
+            private Customer $customer,
+        ) {
             $this->items = new ArrayCollection();
             $this->created = new DateTime("now");
         }

docs/en/tutorials/ordered-associations.rst

@@ -22,9 +22,9 @@ can specify the ``@OrderBy`` in the following way:
         {
             // ...
 
-            #[ManyToMany(targetEntity: "Group")]
+            #[ManyToMany(targetEntity: Group::class)]
             #[OrderBy(["name" => "ASC"])]
-            private $groups;
+            private Collection $groups;
         }
 
     .. code-block:: xml