Added some PHPDoc fixes according to use cases from the docs (https:/…

…/phpseclib.com/docs/sftp) to satisfy PHPStan

phpseclib/Net/SFTP.php

@@ -37,9 +37,10 @@
 
 namespace phpseclib3\Net;
 
-use ParagonIE\ConstantTime\Hex;
 use phpseclib3\Exception\FileNotFoundException;
 use phpseclib3\Common\Functions\Strings;
+use phpseclib3\Crypt\Common\AsymmetricKey;
+use phpseclib3\System\SSH\Agent;
 
 /**
  * Pure-PHP implementations of SFTP.
@@ -430,7 +431,7 @@ public function __construct($host, $port = 22, $timeout = 10)
      * Login
      *
      * @param string $username
-     * @param string[] ...$args
+     * @param string|AsymmetricKey|array[]|Agent|null ...$args
      * @throws \UnexpectedValueException on receipt of unexpected packets
      * @return bool
      * @access public
@@ -2096,7 +2097,7 @@ private function close_handle($handle)
      * $offset and $length can be used to download files in chunks.
      *
      * @param string $remote_file
-     * @param string|bool|resource $local_file
+     * @param string|bool|resource|callable $local_file
      * @param int $offset
      * @param int $length
      * @param callable|null $progressCallback