Add resource requests/limits documentation in values.yaml

This commit adds documentation comments in the
charts/paperless-ngx/values.yaml file regarding the
setting of resource requests and limits for the
container. The addition aims to clarify how users can
customize resource management for their Paperless-ngx
deployment. There were no functional changes made to
the code; the comment serves as a guide for future
configuration. No breaking changes were introduced.

charts/paperless-ngx/values.yaml

@@ -17,6 +17,8 @@ controllers:
         tag: 2.20.0
         # -- Environment variables [[ref]](https://docs.paperless-ngx.com/configuration/)
         # @default -- See [values.yaml](./values.yaml)
+        # -- Set the resource requests / limits for the container.
+        # resources:
 env:
   # -- Set the container timezone
   TZ: UTC