Update exercises/concept/lasagna/.docs/introduction.md

I’d like to suggest a small update to packages section for clarity.

The section on packages discusses camelCase vs PascalCase before setting the package name. This seems more relevant after the package name has been established. It made me think “wait, how is camelCase vs PascalCase relevant to the package name?” and could be confusing to others. I think having the discussion of what is exported from the package until after the package name is set would be better.

Thanks for all you guys do, and Happy New Year,

ps: this was Update exercises/concept/lasagna/.docs/introduction.md by cjon256 · Pull Request #2846 · exercism/go · GitHub if that makes it easier to merge? It should at least resolve any ambiguity in my suggestion.

Cullen