Clarity on constructor of Board object for tutorial.md

[DaveVoyles]

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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-

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[lacker]

Yes... I think you are correct here. Also the later part of this sentence mentions "Board" when I think it's clearer to just mention "Square" so I tweaked the docs there as well. Thanks for submitting this pull request!