fix trailing slash handling for distribution redir

api/docker/caddy/Caddyfile

@@ -9,7 +9,8 @@ log {
 	output file /var/log/caddy/access.log
 }
 
-redir /docs/distribution /docs/symfony
+@distribution path_regexp ^/docs/distribution(?:/?)$
+redir @distribution /docs/symfony/
 
 @docsroot path_regexp ^/docs(/?)$
 redir @docsroot /docs/symfony/