update api docs

Author: zajca

apiary.apib

@@ -5837,7 +5837,7 @@ Returns an array of jobs instead of a single job.
     + workspace_id (required, number) - Workspace ID
 
 + Attributes
-    + only-direct-grants (optional, boolean) - Filter for direct-grant tables only
+    + only-direct-grants (optional, boolean) - Will unload only tables with direct-grant unload strategy no others.
         Default: false
 
 + Request (application/json)