Static analysis improvements (#1475)

* Static analysis improvements

* Fix review issues

src/Monolog/Logger.php

@@ -140,6 +140,8 @@ class Logger implements LoggerInterface, ResettableInterface
     protected $exceptionHandler;
 
     /**
+     * @psalm-param array<callable(array): array> $processors
+     *
      * @param string             $name       The logging channel, a simple descriptive name that is attached to all log records
      * @param HandlerInterface[] $handlers   Optional stack of handlers, the first one in the array is called first, etc.
      * @param callable[]         $processors Optional array of processors