Replace $(AMP) with "and" in title

Avoids anchor breakage.

spec.dd

@@ -24,7 +24,7 @@ $(TOC Table of Contents,
 	$(TOCENTRY statement, Statements)
 	$(TOCENTRY arrays, Arrays)
 	$(TOCENTRY hash-map, Associative Arrays)
-	$(TOCENTRY struct, Structs $(AMP) Unions)
+	$(TOCENTRY struct, Structs and Unions)
 	$(TOCENTRY class, Classes)
 	$(TOCENTRY interface, Interfaces)
 	$(TOCENTRY enum, Enums)