docs: fix bullet points indentation
This was wrong and didn't get rendered correctly.  Thanks markdown.
@@ -71,7 +71,6 @@ metrics:
- `connect_to_reserved_ips`: Allow reserved IP addresses for requests to
sources. See [Security](#security). Defaults to `false`.
- `caches`: Fine-tune cache expiry.
-
All time units can be either a time expression like `1s`. Units
can be `s`, `seconds`, `m`, `minutes`, `h`, `hours`, `d`, `days`,
`w`, `weeks`, `M`, `months`, `y`, `years`. Or they can be `null`
