docs: minor docs update

Changed files
+2 -1
docs
internal
+1
docs/internal/ports.md
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- `20xxx`: Prometheus/Metrics
- `2009x`: core metrics, node metrics
- `201xx`: service metrics
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<!-- note: grafana uses unix sockets instead. -->
- `3xxxx`: Service ports
- `35xxx`: exposed docker container ports
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docs/utils.md
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The definition of `secretHelpers` is defined as follows:
```nix
secretHelpers = {
-
generate = {}; # => {sops.secrets.* = <sopsConfig>}
+
generate = {}; # => {sops.secrets.* = <sopsConfig>} (inline module)
get = path: ""; # => actual path of the secret, usually /run/secrets/the/secret
placeholder = path: ""; # => placeholder string generated by sops-nix, for that secret path to be used in templates.