minor #40728 [PHPDoc] Fix some union type cases (fancyweb)

This PR was merged into the 4.4 branch.

Discussion
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[PHPDoc] Fix some union type cases

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

While working on symfony/symfony#40154, I discovered some PHPDoc issues, I'm going to comment in the review. Upper branches will need some fixes too.

Commits
-------

dd1481642b [PHPDoc] Fix some union type cases

Author: Nyholm

Descriptor/Descriptor.php

@@ -72,36 +72,26 @@ protected function write($content, $decorated = false)
 
     /**
      * Describes an InputArgument instance.
-     *
-     * @return string|mixed
      */
     abstract protected function describeInputArgument(InputArgument $argument, array $options = []);
 
     /**
      * Describes an InputOption instance.
-     *
-     * @return string|mixed
      */
     abstract protected function describeInputOption(InputOption $option, array $options = []);
 
     /**
      * Describes an InputDefinition instance.
-     *
-     * @return string|mixed
      */
     abstract protected function describeInputDefinition(InputDefinition $definition, array $options = []);
 
     /**
      * Describes a Command instance.
-     *
-     * @return string|mixed
      */
     abstract protected function describeCommand(Command $command, array $options = []);
 
     /**
      * Describes an Application instance.
-     *
-     * @return string|mixed
      */
     abstract protected function describeApplication(Application $application, array $options = []);
 }

Descriptor/TextDescriptor.php

@@ -298,7 +298,7 @@ private function formatDefaultValue($default): string
     }
 
     /**
-     * @param (Command|string)[] $commands
+     * @param array<Command|string> $commands
      */
     private function getColumnWidth(array $commands): int
     {

Helper/QuestionHelper.php

@@ -97,7 +97,7 @@ public static function disableStty()
     /**
      * Asks the question to the user.
      *
-     * @return bool|mixed|string|null
+     * @return mixed
      *
      * @throws RuntimeException In case the fallback is deactivated and the response cannot be hidden
      */