Issue #26736: Used HTTPS for external links in the documentation if possible.
diff --git a/Doc/howto/unicode.rst b/Doc/howto/unicode.rst
index 8138a09..afd89c7 100644
--- a/Doc/howto/unicode.rst
+++ b/Doc/howto/unicode.rst
@@ -211,7 +211,7 @@
To help understand the standard, Jukka Korpela has written an introductory guide
to reading the Unicode character tables, available at
-<http://www.cs.tut.fi/~jkorpela/unicode/guide.html>.
+<https://www.cs.tut.fi/~jkorpela/unicode/guide.html>.
Another good introductory article was written by Joel Spolsky
<http://www.joelonsoftware.com/articles/Unicode.html>.