#10695: use %s not %d so that a string 'port' does not cause a debug traceback

Passing the port as a string value works fine in regular mode, but
if you turned debug on it would throw an error trying to print the
port number, which is surprising and confusing.
diff --git a/Misc/NEWS b/Misc/NEWS
index aa90c16..d2a2c42 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -11,6 +11,9 @@
 Library
 -------
 
+- Issue #10695: passing the port as a string value to telnetlib no longer
+  causes debug mode to fail.
+
 - Issue #1078919: add_header now automatically RFC2231 encodes parameters
   that contain non-ascii values.