change some documentation.

web/app/models.py

@@ -327,7 +327,7 @@ class Job(db.Model):
     service = db.Column(db.String(64))
     '''
     ' Service specific arguments as string list.
-    ' Example: ["-l eng", "--keep-intermediates", "--skip-binarization"]
+    ' Example: ["-l eng", "--binarize"]
     '''
     service_args = db.Column(db.String(255))
     service_version = db.Column(db.String(16))