Small mismatch between text and code in section 1.3 (Pattern Matching)

[jryans]

Thanks for all your work on this book, it's a great resource! 😄

I'm starting to read through it now, and I noticed what seems like a small mismatch between the text and code in section 1.3 (Pattern Matching). The text below says four alternatives and four clauses, but the concrete syntax and match invocation seem to each have five items.

https://github.com/IUCompilerCourse/Essentials-of-Compilation/blob/e0bf9a4e6b17a315720cc1703fd69bce9bc5c890/book.tex#L1238-L1240

[jsiek]

Thanks! Fixed.