Fix document and improve comment (#24844)

* Fix broken doc link:
https://github.com/go-gitea/gitea/actions/runs/5041309438/jobs/9040887385
* Improve comments about how font weight works:
https://github.com/go-gitea/gitea/pull/24827#pullrequestreview-1435584800

---------

Co-authored-by: silverwind <me@silverwind.io>

docs/content/doc/help/faq.en-us.md

@@ -136,7 +136,7 @@ A "login prohibited" user is a user that is not allowed to log in to Gitea anymo
 
 ## Setting up logging
 
-- [Official Docs]({{< relref "doc/administration/logging-documentation.en-us.md" >}})
+- [Official Docs]({{< relref "doc/administration/logging-config.en-us.md" >}})
 
 ## What is Swagger?
 

web_src/css/base.css

@@ -3,7 +3,7 @@
   --fonts-proportional: -apple-system, "Segoe UI", system-ui, Roboto, "Helvetica Neue", Arial;
   --fonts-monospace: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace, var(--fonts-emoji);
   --fonts-emoji: "Apple Color Emoji", "Segoe UI Emoji", "Noto Color Emoji", "Twemoji Mozilla";
-  /* font weights - use between 400 and 600 for general purposes */
+  /* font weights - use between 400 and 600 for general purposes. Avoid 700 as it is perceived too bold */
   --font-weight-light: 300;
   --font-weight-normal: 400;
   --font-weight-medium: 500;