fix doc

docs/en/latest/plugins/limit-conn.md

@@ -33,7 +33,7 @@ The `limit-conn` Plugin limits the number of concurrent requests to your service
 ## Attributes
 
 | Name                     | Type    | Required | Default     | Valid values                      | Description                                                                                                                                                                                                                                                                                                                                                                                               |
-|--------------------------|---------| -------- |-------------|-----------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| ---------------------- | ------- | -------- | ------- | -------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
 | conn                     | integer | True     |             | conn > 0                          | Maximum number of concurrent requests allowed. Requests exceeding this ratio (and below `conn` + `burst`) will be delayed (configured by `default_conn_delay`).                                                                                                                                                                                                                                           |
 | burst                    | integer | True     |             | burst >= 0                        | Number of additional concurrent requests allowed to be delayed per second. If the number exceeds this hard limit, they will get rejected immediately.                                                                                                                                                                                                                                                     |
 | default_conn_delay       | number  | True     |             | default_conn_delay > 0            | Delay in seconds to process the concurrent requests exceeding `conn` (and `conn` + `burst`).                                                                                                                                                                                                                                                                                                              |