a2ensite: update en link to latest instead of buster

pages/linux/a2ensite.md

@@ -1,7 +1,7 @@
 # a2ensite
 
 > Enable an Apache virtual host on Debian-based OSes.
-> More information: <https://manpages.debian.org/buster/apache2/a2ensite.8.en.html>.
+> More information: <https://manpages.debian.org/latest/apache2/a2ensite.8.en.html>.
 
 - Enable a virtual host: