docs(nginx): fix nginx directory, system api proto description (#5809)

Co-authored-by: Elio Bischof <elio@zitadel.com>

docs/nginx.conf

@@ -15,7 +15,7 @@ http {
         } 
  
         location /docs { 
-            root /usr/share/nginx/html;
+            alias /usr/share/nginx/html;
             index /docs/index.html;
             try_files $uri $uri/ /docs/index.html?q=$query_string; 
         } 
@@ -23,7 +23,7 @@ http {
         location = /docs/proxy/js/script.js {
             proxy_pass https://plausible.io/js/script.js;
             proxy_set_header Host plausible.io;
-            }
+        }
 
         location = /docs/proxy/api/event {
             proxy_pass https://plausible.io/api/event;
@@ -53,4 +53,4 @@ http {
       application/xml 
       application/json 
       application/ld+json; 
-}
+}