Clarify example "Export boundary functions"

[JamesSlocumIH]

The following example is confusing.

• If Config is supposed to be a parameter object, it should be named Params since the constructor is called New(...) and needs defined fx.In within.
• If it is not meant to be an parameter object, I think passing Params into the constructor without defining that in the example is confusing.
  • Maybe we should be passing a Config instead? i.e. New(c Config)

I changed the example to use a parameter object, because I think using the parameter object makes sense here. I think if its not supposed to use a parameter object, updating the names of Params or Config to align could help make the example more clear.

[CLAassistant]

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