Doc: Fixed issue 40017 (#40152)

* Added content as suggested by Will

* removed a few extra words.

* Update docs/sources/administration/configuration.md

Co-authored-by: Fiona Artiaga <89225282+GrafanaWriter@users.noreply.github.com>

* Update docs/sources/administration/configuration.md

Co-authored-by: Fiona Artiaga <89225282+GrafanaWriter@users.noreply.github.com>

* Update docs/sources/administration/configuration.md

Co-authored-by: Fiona Artiaga <89225282+GrafanaWriter@users.noreply.github.com>

Co-authored-by: Fiona Artiaga <89225282+GrafanaWriter@users.noreply.github.com>
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@ -45,9 +45,11 @@ For example:
;http_port = 3000
```
## Configure with environment variables
## Override configuration with environment variables
All options in the configuration file can be overridden using environment variables using the syntax:
Do not use environment variables to _add_ new configuration settings. Instead, use environmental variables to _override_ existing options.
To override an option:
```bash
GF_<SectionName>_<KeyName>