Fix #1066: Use correct docblock castings.

src/Monolog/ErrorHandler.php

@@ -49,10 +49,10 @@ class ErrorHandler
      *
      * By default it will handle errors, exceptions and fatal errors
      *
-     * @param  LoggerInterface $logger
-     * @param  array|false     $errorLevelMap     an array of E_* constant to LogLevel::* constant mapping, or false to disable error handling
-     * @param  array|false     $exceptionLevelMap an array of class name to LogLevel::* constant mapping, or false to disable exception handling
-     * @param  int|false       $fatalLevel        a LogLevel::* constant, or false to disable fatal error handling
+     * @param  LoggerInterface    $logger
+     * @param  array|false        $errorLevelMap     an array of E_* constant to LogLevel::* constant mapping, or false to disable error handling
+     * @param  array|false        $exceptionLevelMap an array of class name to LogLevel::* constant mapping, or false to disable exception handling
+     * @param  string|null|false $fatalLevel        a LogLevel::* constant, null to use the default LogLevel::ALERT or false to disable fatal error handling
      * @return ErrorHandler
      */
     public static function register(LoggerInterface $logger, $errorLevelMap = [], $exceptionLevelMap = [], $fatalLevel = null): self