minor #33262 More docblock fixes (nicolas-grekas)

This PR was merged into the 3.4 branch.

Discussion
----------

More docblock fixes

| Q             | A
| ------------- | ---
| Branch?       | 3.4
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Found while working on #33259

Commits
-------

9b78d53d0d More docblock fixes

src/Symfony/Component/Cache/CacheItem.php

@@ -56,6 +56,8 @@ final class CacheItem implements CacheItemInterface
 
     /**
      * {@inheritdoc}
+     *
+     * @return $this
      */
     public function set($value)
     {
@@ -66,6 +68,8 @@ final class CacheItem implements CacheItemInterface
 
     /**
      * {@inheritdoc}
+     *
+     * @return $this
      */
     public function expiresAt($expiration)
     {
@@ -82,6 +86,8 @@ final class CacheItem implements CacheItemInterface
 
     /**
      * {@inheritdoc}
+     *
+     * @return $this
      */
     public function expiresAfter($time)
     {
@@ -103,7 +109,7 @@ final class CacheItem implements CacheItemInterface
      *
      * @param string|string[] $tags A tag or array of tags
      *
-     * @return static
+     * @return $this
      *
      * @throws InvalidArgumentException When $tag is not valid
      */

src/Symfony/Component/DomCrawler/FormFieldRegistry.php

@@ -121,8 +121,10 @@ class FormFieldRegistry
         if ((!\is_array($value) && $target instanceof Field\FormField) || $target instanceof Field\ChoiceFormField) {
             $target->setValue($value);
         } elseif (\is_array($value)) {
-            $fields = self::create($name, $value);
+            $registry = new static();
-            foreach ($fields->all() as $k => $v) {
+            $registry->base = $name;
+            $registry->fields = $value;
+            foreach ($registry->all() as $k => $v) {
                 $this->set($k, $v);
             }
         } else {
@@ -140,26 +142,6 @@ class FormFieldRegistry
         return $this->walk($this->fields, $this->base);
     }
 
-    /**
-     * Creates an instance of the class.
-     *
-     * This function is made private because it allows overriding the $base and
-     * the $values properties without any type checking.
-     *
-     * @param string $base   The fully qualified name of the base field
-     * @param array  $values The values of the fields
-     *
-     * @return static
-     */
-    private static function create($base, array $values)
-    {
-        $registry = new static();
-        $registry->base = $base;
-        $registry->fields = $values;
-
-        return $registry;
-    }
-
     /**
      * Transforms a PHP array in a list of fully qualified name / value.
      *

src/Symfony/Component/Serializer/Normalizer/DenormalizerInterface.php

@@ -34,7 +34,7 @@ interface DenormalizerInterface
      * @param string $format  Format the given data was extracted from
      * @param array  $context Options available to the denormalizer
      *
-     * @return object
+     * @return object|array
      *
      * @throws BadMethodCallException   Occurs when the normalizer is not called in an expected context
      * @throws InvalidArgumentException Occurs when the arguments are not coherent or not supported