Change to https link.

Author: HonkingGoose

book/04-git-server/sections/smart-http.asc

@@ -68,5 +68,5 @@ You can do this with nearly any CGI-capable web server, so go with the one that
 
 [NOTE]
 ====
-For more information on configuring authentication in Apache, check out the Apache docs here: http://httpd.apache.org/docs/current/howto/auth.html[]
+For more information on configuring authentication in Apache, check out the Apache docs here: https://httpd.apache.org/docs/current/howto/auth.html[]
 ====