some words about Firstkey and Nextkey

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@5764 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Doc/Manual/Extending.html

@@ -1055,6 +1055,21 @@ reference count on the corresponding object (if any).  Returns 1
 if an object was removed, 0 otherwise.
 </blockquote>
 
+<p>
+<b><tt>String *Firstkey(Hash *h)</tt></b>
+<blockquote>
+Returns the first hash table key or NULL if the hash is empty.
+Used for iteration.
+</blockquote>
+
+<p>
+<b><tt>String *Nextkey(Hash *h)</tt></b>
+<blockquote>
+Returns the next hash table key or NULL
+if the end of the hash has been reached.
+Used for iteration.
+</blockquote>
+
 <p>
 <b><tt>List *Keys(Hash *h)</tt></b>
 <blockquote>
@@ -2817,4 +2832,4 @@ extern "X" { ... } declaration.
 
 <address>SWIG 1.3 - Last Modified : January 22, 2002</address>
 </body>
-</html>
+</html>