Update simple-algebraic-data-types.tex (#244)

turning record in to a new term

src/content/1.6/simple-algebraic-data-types.tex

@@ -133,7 +133,7 @@ \section{Product Types}
 Programming with tuples and multi-argument constructors can get messy
 and error prone --- keeping track of which component represents what.
 It's often preferable to give names to components. A product type with
-named fields is called a record in Haskell, and a \code{struct} in C.
+named fields is called a \newterm{record} in Haskell, and a \code{struct} in C.
 
 \section{Records}