doc: update docs/nginx.md (#836)

docs/nginx.md

@@ -897,26 +897,26 @@ location = /robots.txt {
 
 ```nginx
 server {
-	listen 80;
-	server_name xxx.top;
+  listen 80;
+  server_name xxx.top;
 
-	location / {
-		access_log /data/logs/nginx/json_ip.log json;
-		proxy_set_header Host $http_host;
+  location / {
+    access_log /data/logs/nginx/json_ip.log json;
+    proxy_set_header Host $http_host;
         proxy_set_header X-Real-Ip $remote_addr;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_pass http://127.0.0.1:9999;
-	}
+  }
 }
 
 server {
-	listen 9999;
+  listen 9999;
 
-	location / {
-		access_log off;
-		default_type application/json;
-		return 200 "{\"ip\":\"$http_X_Real_Ip\"}";
-	}
+  location / {
+    access_log off;
+    default_type application/json;
+    return 200 "{\"ip\":\"$http_X_Real_Ip\"}";
+  }
 }
 ```
 
@@ -973,6 +973,7 @@ server {
     }
 
 }
+```
 
 ### 流量镜像配置
 <!--rehype:wrap-class=col-span-3-->