section -> subsection

book.tex

@@ -14420,7 +14420,7 @@ initialize the elements analogous to the case for tuples.
 
 
 {\if\edition\racketEd
-\section{Uncover \texttt{get!}}
+\subsection{Uncover \texttt{get!}}
 \label{sec:uncover-get-bang-vecof}
 
 Add cases for \code{AllocateArray} to \code{collect-set!} and