docs(utils): document new mkSimpleProxy signature

* documents the new signature for mkSimpleProxy, adding extraConfig.

Changed files
+9 -2
docs
+9 -2
docs/utils.md
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## `_utils.mkVhost`
`attrset -> attrset`
-
make virtual host with sensible defaults
+
make a virtual host with sensible defaults
pass in a set to override the defaults.
···
port,
protocol ? "http",
location ? "/",
-
websockets ? false
+
websockets ? false,
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extraConfig ? {}
}
```
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+
It is recommended to override/add attributes with `extraConfig` to
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preserve defaults.
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Items in `extraConfig` are merged verbatim to the base attrset with defaults.
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They are overridden based on their order.
## `_utils.genSecrets`
`namespace[str] -> files[list[str]] -> value[attrset] -> attrset`