Fix some phpdoc

lib/Doctrine/ODM/MongoDB/Aggregation/Builder.php

@@ -465,7 +465,7 @@ public function redact(): Stage\Redact
      * including the _id field. You can promote an existing embedded document to
      * the top level, or create a new document for promotion.
      *
-     * @param string|array|null $expression Optional. A replacement expression that
+     * @param string|array|Expr|null $expression Optional. A replacement expression that
      * resolves to a document.
      */
     public function replaceRoot($expression = null): Stage\ReplaceRoot

lib/Doctrine/ODM/MongoDB/Aggregation/Stage/AbstractBucket.php

@@ -33,7 +33,7 @@ abstract class AbstractBucket extends Stage
     /** @var Bucket\AbstractOutput|null */
     protected $output;
 
-    /** @var Expr|array */
+    /** @var Expr|array|string */
     protected $groupBy;
 
     public function __construct(Builder $builder, DocumentManager $documentManager, ClassMetadata $class)
@@ -48,7 +48,7 @@ public function __construct(Builder $builder, DocumentManager $documentManager,
      * An expression to group documents by. To specify a field path, prefix the
      * field name with a dollar sign $ and enclose it in quotes.
      *
-     * @param array|Expr $expression
+     * @param array|Expr|string $expression
      */
     public function groupBy($expression): self
     {

lib/Doctrine/ODM/MongoDB/Aggregation/Stage/Bucket.php

@@ -26,7 +26,7 @@ class Bucket extends AbstractBucket
      * boundaries. The specified values must be in ascending order and all of
      * the same type. The exception is if the values are of mixed numeric types.
      *
-     * @param array ...$boundaries
+     * @param mixed $boundaries
      */
     public function boundaries(...$boundaries): self
     {

lib/Doctrine/ODM/MongoDB/Aggregation/Stage/ReplaceRoot.php

@@ -24,7 +24,7 @@ class ReplaceRoot extends Operator
     /** @var ClassMetadata */
     private $class;
 
-    /** @var string|array|null */
+    /** @var string|array|Expr|null */
     private $expression;
 
     public function __construct(Builder $builder, DocumentManager $documentManager, ClassMetadata $class, $expression = null)

lib/Doctrine/ODM/MongoDB/Mapping/ClassMetadata.php

@@ -58,7 +58,7 @@
  *    the serialized representation).
  *
  * @final
- * @template T of object
+ * @template-covariant T of object
  * @template-implements BaseClassMetadata<T>
  */
 /* final */ class ClassMetadata implements BaseClassMetadata