Clarity on constructor of Board object for tutorial.md (#8224)

* Update tutorial.md

Is it possible to be more clear here?
 This implies that we are removing the constructor from GAME, and not board (which is what I believe the author is trying to say).
It took me several reads to understand. 

With this edit, it is now clear that the adjustment is being made to -Board- and not to -Game-

* also remove "for Board earlier"

docs/tutorial/tutorial.md

@@ -353,7 +353,7 @@ class Game extends React.Component {
 }
 ```
 
-Then remove the constructor and change `Board` so that it takes `squares` via props and has its own `onClick` prop specified by `Game`, like the transformation we made for `Square` and `Board` earlier. You can pass the location of each square into the click handler so that we still know which square was clicked:
+Then remove the constructor from `Board` and change `Board` so that it takes `squares` via props and has its own `onClick` prop specified by `Game`, like the transformation we made for `Square` earlier. You can pass the location of each square into the click handler so that we still know which square was clicked:
 
 ```javascript
 return <Square value={this.props.squares[i]} onClick={() => this.props.onClick(i)} />;