Update README.

README.md

@@ -27,7 +27,7 @@ The following env variables can be used to configure the mod (all are optional)
 |   `GSP_GTN_ADDR`       | `http://localhost:8000` | Gluetun API host address.                                                                                |
 |   `GSP_QBT_ADDR`       | `http://localhost:8080` | Qbittorrent API host address. If the env variable `WEBUI_PORT` is set, it will be used as default.       |
 |     `GSP_SLEEP`        |           `60`          | Time between checks in seconds.                                                                          |
-|  `GSP_RETRY_DELAY`     |           `10`          | Time between retry in case of error (in s).                                                              |
+|  `GSP_RETRY_DELAY`     |           `10`          | Time between retries in case of error (in s).                                                            |
 | `GSP_QBT_USERNAME`     |                         | Qbittorrent username.                                                                                    |
 | `GSP_QBT_PASSWORD`     |                         | Qbittorrent password.                                                                                    |
 | `GSP_QBT_PASSWORD_FILE`|                         | Qbittorrent password file (for [docker secret](https://docs.docker.com/compose/use-secrets/) use). This supplants `GSP_QBT_PASSWORD`. |