docs: tweak wording

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

@@ -48,8 +48,8 @@ For production use cases, it is **recommended** to set at least:
 | `NC_SMTP_FROM` | E-mail sender address for SMTP plugin. | *SMTP plugin is disabled if this variable is not set.* |
 | `NC_SMTP_HOST` | E-mail server hostname for SMTP plugin. | *SMTP plugin is disabled if this variable is not set.* |
 | `NC_SMTP_PORT` | E-mail server network for SMTP plugin. | *SMTP plugin is disabled if this variable is not set.* |
-| `NC_SMTP_USERNAME` | User name for authentication in SMTP plugin. | |
-| `NC_SMTP_PASSWORD` | User password for authentication in SMTP plugin. | |
+| `NC_SMTP_USERNAME` | Username for authentication in SMTP plugin. | |
+| `NC_SMTP_PASSWORD` | Password for authentication in SMTP plugin. | |
 | `NC_SMTP_SECURE` | Enable secure authentication in SMTP plugin. Set to `true` to enable, any other value is treated as `false`. | |
 | `NC_SMTP_IGNORE_TLS` | Ignore TLS in SMTP plugin. Set to `true` to ignore TLS, any other value is treated as `false`. For more information, visit [Nodemailer SMTP documentation](https://nodemailer.com/smtp/). | |
 | `NC_S3_BUCKET_NAME` | AWS S3 bucket name for S3 storage plugin. | |