remove unnecessary sentence

docs/learn/order-book.md

@@ -43,11 +43,10 @@ trade, transferring the specified asset between parties at the agreed price, and
 update the order book to reflect the completion of the trade.
 
 The taker has the ability to partially fill the order for a given
-`maker_partial_fill` amount. This amount specifies the partial amount of what
-the maker wants to fill. The maker always wants to fill the `taker_amount` of
-the specified taker asset (in `place_order`). Thus, the `maker_partial_fill` (if
-a partial fill is wanted) should be smaller than the `taker_amount` of the maker
-order.
+`maker_partial_fill` amount. The maker always wants to fill the `taker_amount`
+of the specified taker asset (in `place_order`). Thus, the `maker_partial_fill`
+(if a partial fill is wanted) should be smaller than the `taker_amount` of the
+maker order.
 
 ### Remove Order