Grammar fixes

PedanticHacker · web-flow · commit 9c865d985d3c · 2019-05-07T10:21:59.000+02:00
Fixed some grammar. It was missed at my last review.
diff --git a/chess/__init__.py b/chess/__init__.py
@@ -690,7 +690,7 @@ def attacks_mask(self, square: Square) -> Bitboard:
 
     def attacks(self, square: Square) -> "SquareSet":
         """
-        Gets a set of attacked squares from a given square.
+        Gets a set of attacked squares from the given square.
 
         There will be no attacks if the square is empty. Pinned pieces are
         still attacking other squares.
