last remaining hardcoded chapter reference

xml/others/03prefaces03.xml

@@ -13,7 +13,7 @@
     <INDEX>SICP</INDEX>
     (SICP) introduces the reader to central ideas of
     computation by establishing a series of mental models for computation.
-    Chapters 1<ENDASH/>3 cover programming concepts that are common to all
+    Chapters<SPACE/><REF NAME="chap:fun"></REF><ENDASH/><REF NAME="chap:state"></REF> cover programming concepts that are common to all
     modern high-level programming languages. The original first two editions
     of SICP use the programming language Scheme in their program examples,
     whose minimalist, expression-oriented syntax allows the book to focus