Reformat decl of new _PyString_Join. Add NEWS blurb about repr() speedup.

Misc/NEWS

@@ -126,6 +126,9 @@ Core
   faster now.  Thanks to Christian Tismer for pointing out the cause and
   the nature of an effective cure (last December! better late than never).
 
+- repr() is much faster for large containers (dict, list, tuple).
+
+
 Library
 
 - A new function fnmatch.filter to filter lists of file names was added.

Objects/stringobject.c

@@ -1031,7 +1031,8 @@ string_join(PyStringObject *self, PyObject *args)
 	return res;
 }
 
-PyObject *_PyString_Join(PyObject *sep, PyObject *x)
+PyObject *
+_PyString_Join(PyObject *sep, PyObject *x)
 {
 	PyObject* args;
 	PyObject* result = NULL;