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Begin Until explanation fix #15

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Begin Until explanation fix #15

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Expand Up @@ -682,7 +682,7 @@ Now hit `B`, then `C`, and you should see the following:

Forth has another kind of loop called `begin until`. This works like a `while`
loop in C-based languages. Every time the word `until` is hit, the interpreter
checks to see if the top of the stack is non-zero (true). If it is, it jumps
checks to see if the top of the stack is non-zero (true). If it is false, it jumps
back to the matching `begin`. If not, execution continues.

Here's an example of using `begin until` to print key codes:
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