Convert boolean typehints into bool

Author: bnymn

setup/src/Magento/Setup/Controller/DatabaseCheck.php

@@ -67,7 +67,7 @@ public function indexAction()
 
     /**
      * @param array $params
-     * @return boolean
+     * @return bool
      */
     private function isDriverOptionsGiven($params)
     {

setup/src/Magento/Setup/Validator/DbValidator.php

@@ -42,7 +42,7 @@ public function __construct(ConnectionFactory $connectionFactory)
      * Check if database table prefix is valid
      *
      * @param string $prefix
-     * @return boolean
+     * @return bool
      * @throws \InvalidArgumentException
      */
     public function checkDatabaseTablePrefix($prefix)
@@ -72,7 +72,7 @@ public function checkDatabaseTablePrefix($prefix)
      * @param string $dbHost
      * @param string $dbUser
      * @param string $dbPass
-     * @return boolean
+     * @return bool
      * @throws \Magento\Setup\Exception
      * @deprecated
      */
@@ -89,7 +89,7 @@ public function checkDatabaseConnection($dbName, $dbHost, $dbUser, $dbPass = '')
      * @param string $dbUser
      * @param string $dbPass
      * @param array $driverOptions
-     * @return boolean
+     * @return bool
      * @throws \Magento\Setup\Exception
      */
     public function checkDatabaseConnectionWithDriverOptions(