Need for Speed: Minor improvements (#1755)

[eklatzer]

Fixes #1755

Hey, I have done the following:

• adjusted the instructions.md to clarify the struct-initialization and the usage of constructors
• renamed variables for consistency

[github-actions]

Dear eklatzer

Thank you for contributing to the Go track on Exercism! 💙
You will see some automated feedback below 🤖. It would be great if you can make sure your PR covers those points. This will save your reviewer some time and your change can be merged quicker.

• 📜 The following files usually contain very similar content.

  • concepts/<concept>/about.md
  • concepts/<concept>/introduction.md
  • exercises/concept/<exercise>/.docs/introduction.md

  Please check whether the changes you made to one of these also need to be applied to the others.

• ✍️ If your PR is not related to an existing issue (and is not self-explaining like a typo fix), please make sure the description explains why the change you made is necessary.

• 🔤 If your PR fixes an easy to identify typo, if would be great if you could check for that typo in the whole repo. For example, if you found Unicdoe, use "replace all" in your editor (or command line magic) to fix it consistently.

Dear Reviewer/Maintainer

• 📏 Make sure you set the appropriate x:size label for the PR. (This also works after merging, in case you forgot about it.)

• 🔍 Don't be too nit-picky. If the PR is a clear improvement compared to the status quo, it should be approved as clear signal this is good to be merged even if the minor comments you might have are not addressed by the contributor. Further improvement ideas can be captured in issues (if important enough) and implemented via additional PRs.

• 🤔 After reviewing the diff in the "Files changed" section, take a moment to think about whether there are changes missing from the diff. Does something need to be adjusted in other places so the code or content stays consistent?

_{Automated comment created by PR Commenter 🤖.}

[eklatzer]

Hey, I adjusted the format of the outputs because I have seen #2202

[eklatzer]

The other changes should fix the TODO's from #1755

[andrerfcsantos]

I'm just going to suggest a change in the order we talk about these concepts. I think we should talk about string literals first and then the New() or New***() functions to create structs. I would leave the explanation of the new builtin for last as it is not as relevant for the exercise .

Also note that the introduction.md for the exercise is often a copy of the introduction.md and about.md of the concept they teach, in this case structs, so the changes must also be reflected there. You can leave this for last, just mentioning so it's not forgotten.

[eklatzer]

I hope I have covered everything you wanted me to change

[eklatzer]

@andrerfcsantos I am a bit confused, have you already checked my changes, is something missing or what is the current state?

[andrerfcsantos]

I did take a look at this and I have some changes in mind, but I want to think about them a little bit better before actually suggesting them. This is why this is taking longer to review, didn't have the chance yet to fully gather and formalize my thoughts - but it is not forgotten! :)

[andrerfcsantos]

Left my review in about.md just to make things simpler, but please also apply the changes in the other files.

[eklatzer]

@andrerfcsantos Thanks for the feedback, I hope I have addressed all of your messages.

Are more details needed in the introduction.md?