docs: lint markdown

Author: hatamiarash7

README.md

@@ -289,7 +289,7 @@ Flags:
 | `nginxplus_upstream_server_requests`                | Counter | Total client requests                                                                                                                                          | `server`, `upstream`                                                                                                                              |
 | `nginxplus_upstream_server_responses`               | Counter | Total responses sent to clients                                                                                                                                | `code` (the response status code. The values are: `1xx`, `2xx`, `3xx`, `4xx` and `5xx`), `server`, `upstream`                                     |
 | `nginxplus_upstream_server_responses_codes`         | Counter | Total responses sent to clients by code                                                                                                                        | `code` (the response status code. The possible values are [here](https://www.nginx.com/resources/wiki/extending/api/http/)), `server`, `upstream` |
-| `nginxplus_upstream_server_sent`                     | Counter | Bytes sent to this server                                                                                                                                      | `server`, `upstream`                                                                                                                              |
+| `nginxplus_upstream_server_sent`                    | Counter | Bytes sent to this server                                                                                                                                      | `server`, `upstream`                                                                                                                              |
 | `nginxplus_upstream_server_received`                | Counter | Bytes received to this server                                                                                                                                  | `server`, `upstream`                                                                                                                              |
 | `nginxplus_upstream_server_fails`                   | Counter | Number of unsuccessful attempts to communicate with the server                                                                                                 | `server`, `upstream`                                                                                                                              |
 | `nginxplus_upstream_server_unavail`                 | Counter | How many times the server became unavailable for client requests (state 'unavail') due to the number of unsuccessful attempts reaching the max_fails threshold | `server`, `upstream`                                                                                                                              |