Add docs to Drush\Drush::process.

Author: weitzman

src/Drush.php

@@ -347,6 +347,9 @@ public static function siteProcess(AliasRecord $siteAlias, $args = [], $options
     /**
      * Run a bash fragment locally.
      *
+     * The timeout parameter on this method doesn't work. It exists for compatibility with parent.
+     * Call this method to get a Process and then call setters as needed.
+     *
      * @param string|array   $commandline The command line to run
      * @param string|null    $cwd         The working directory or null to use the working dir of the current PHP process
      * @param array|null     $env         The environment variables or null to use the same environment as the current PHP process