Added some missing index entries, noted by L. Peter Deutsch.

Doc/ref/ref7.tex

@@ -298,6 +298,7 @@ restriction may be lifted in the future).
 
 \section{Function definitions\label{function}}
 \indexii{function}{definition}
+\stindex{def}
 
 A function definition defines a user-defined function object (see
 section \ref{types}):
@@ -393,6 +394,7 @@ description of the new semantics.
 
 \section{Class definitions\label{class}}
 \indexii{class}{definition}
+\stindex{class}
 
 A class definition defines a class object (see section \ref{types}):
 \obindex{class}