fix docu

Co-authored-by: Thomas Casteleyn <thomas.casteleyn@me.com>

core/config.class.inc.php

@@ -1496,7 +1496,7 @@ class Config
 	protected $m_aCharsets;
 
 	/**
-	 * @var array Password hash algorithm to use.
+	 * @var integer Password hash algorithm to use.
 	 */
 	protected $m_iPasswordHashAlgo;
 
@@ -2492,4 +2492,4 @@ class ConfigPlaceholdersResolver
 		IssueLog::Error($sErrorMessage, self::class, array($sSourceName, $sKey, $sDefault, $sWholeMask));
 		throw new ConfigException($sErrorMessage);
 	}
-}
+}