Update docs.md (#29)

Fixed "paginate" into "pagination" in optgroups formmat

pages/06.data-sources/01.formats/docs.md

@@ -125,7 +125,7 @@ When options are to be generated in `<optgroup>` sections, options should be nes
       ]
     }
   ],
-  "paginate": {
+  "pagination": {
     "more": true
   }
 }