NGINX Plus: Fix inconsistent quoting in access log format example (nginx#465)

fix: make quoting consistent in access log format example

Author: travisamartin

content/nginx/admin-guide/monitoring/logging.md

@@ -64,7 +64,7 @@ http {
     log_format upstream_time '$remote_addr - $remote_user [$time_local] '
                              '"$request" $status $body_bytes_sent '
                              '"$http_referer" "$http_user_agent"'
-                             'rt=$request_time uct="$upstream_connect_time" uht="$upstream_header_time" urt="$upstream_response_time"';
+                             'rt="$request_time" uct="$upstream_connect_time" uht="$upstream_header_time" urt="$upstream_response_time"';
 
     server {
         access_log /spool/logs/nginx-access.log upstream_time;