fix comments

src/board/mod.rs

-//! A module that implements several board games
+//! A module that implements several games
 
 pub mod tictactoe;
 pub mod coin_flip;
 
-/// A trait that defines a Board for a game where we can make a player
+/// A trait that defines a game where we can make a player
 /// play a move and check if a player has won
 pub trait Game<Move, Player> {