Update documentation for string.replace. Thanks to docs@
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index ef1a0c2..a7336c4 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -1029,9 +1029,9 @@
    reached.  Strings starting with a sign are handled correctly.
 
 
-.. function:: replace(str, old, new[, maxreplace])
+.. function:: replace(s, old, new[, maxreplace])
 
-   Return a copy of string *str* with all occurrences of substring *old* replaced
+   Return a copy of string *s* with all occurrences of substring *old* replaced
    by *new*.  If the optional argument *maxreplace* is given, the first
    *maxreplace* occurrences are replaced.