docs: fix comma

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

packages/noco-docs/docs/020.getting-started/050.self-hosted/020.environment-variables.md

@@ -31,7 +31,7 @@ For production use cases, it is **recommended** to set at least:
 | `NC_PUBLIC_URL` | Used for sending E-mail invitations. | Best guess from HTTP request params. |
 | `NC_JWT_EXPIRES_IN` | JWT token expiry time | Defaults to `10h`. |
 | `NC_CONNECT_TO_EXTERNAL_DB_DISABLED` | Disable project creation with external database. | |
-| `NC_INVITE_ONLY_SIGNUP` | Removed since version 0.99.0 and now it's recommended to use the [super admin settings menu](/account-settings/oss-specific-details#enable--disable-signup). Disable public signup and allow signup only via invitations. | |
+| `NC_INVITE_ONLY_SIGNUP` | Removed since version 0.99.0, and now it's recommended to use the [super admin settings menu](/account-settings/oss-specific-details#enable--disable-signup). Disable public signup and allow signup only via invitations. | |
 | `NUXT_PUBLIC_NC_BACKEND_URL` | Custom backend URL. | Defaults to `http://localhost:8080`. |
 | `NC_REQUEST_BODY_SIZE` | Request body size [limit](https://expressjs.com/en/resources/middleware/body-parser.html#limit) | Defaults to `1048576`. |
 | `NC_EXPORT_MAX_TIMEOUT` | After `NC_EXPORT_MAX_TIMEOUT` (in milliseconds), CSV gets downloaded in batches. | Defaults to `5000` (5 seconds). |