grains: Updated the exercise README
Relevant PR:
@@ -6,14 +6,14 @@ on each square doubles.
There once was a wise servant who saved the life of a prince. The king
promised to pay whatever the servant could dream up. Knowing that the
king loved chess, the servant told the king he would like to have grains
-of wheat. One grain on the first square of a chess board. Two grains on
-the next. Four on the third, and so on.
+of wheat. One grain on the first square of a chess board, with the number
+of grains doubling on each successive square.
-There are 64 squares on a chessboard.
+There are 64 squares on a chessboard (where square 1 has one grain, square 2 has two grains, and so on).
Write code that shows:
-- how many grains were on each square, and
-- the total number of grains
+- how many grains were on a given square, and
+- the total number of grains on the chessboard
## For bonus points
