tweak

book.tex

@@ -5774,12 +5774,12 @@ the caller and callee's frame overlap in memory.  As we begin to copy
 the arguments from their sources in the caller's frame, the target
 locations in the callee's frame might overlap with the sources for
 later arguments! We solve this problem by not using the stack for
-paramter passing but instead use the heap, as we describe in the next
-section.
+parameter passing but instead use the heap, as we describe in the
+Section~\ref{sec:limit-functions-r4}.
 
-As briefly mentioned above, for a tail call we pop the caller's frame
-prior to making the tail call. The instructions for popping a frame
-are the instructions that we usually place in the conclusion of a
+As mentioned above, for a tail call we pop the caller's frame prior to
+making the tail call. The instructions for popping a frame are the
+instructions that we usually place in the conclusion of a
 function. Thus, we also need to place such code immediately before
 each tail call. These instructions include restoring the callee-saved
 registers, so it is good that the argument passing registers are all