Make it clear what a figure is

[chrollorifat]

This commit will:

• make the term "figure" clear to people who have never played blackjack before

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[chrollorifat]

@iHiD Hi Jeremy, I have implemented the reviewed suggestion. It's now mergeable.

[iHiD]

Thanks. I'll wait for a Go maintainer to check they're happy, then we can merge :)