Added missing index entries for mapping methods. Closes patch #548693.

Doc/lib/libstdtypes.tex

@@ -975,7 +975,13 @@ arbitrary objects):
   \ttindex{keys()}
   \ttindex{update()}
   \ttindex{values()}
-  \ttindex{get()}}
+  \ttindex{get()}
+  \ttindex{setdefault()}
+  \ttindex{pop()}
+  \ttindex{popitem()}
+  \ttindex{iteritems()}
+  \ttindex{iterkeys)}
+  \ttindex{itervalues()}}
 
 \begin{tableiii}{c|l|c}{code}{Operation}{Result}{Notes}
   \lineiii{len(\var{a})}{the number of items in \var{a}}{}