Add Arc and Mutex to Arc/Mutex example

[sudonym1]

No description provided.

[mgeisler]

Hey @sudonym1,

Thanks for the PR — I think you basically "solved" it by adding the code which I normally add when live-coding in class 😄 That is, your changes are better suited for a speaker note (#53) than the main text.

[mgeisler]

@sudonym1 could you please recast this as an update to the speaker notes? Start by adding a <details> ... </details> block to the page and then explain things inside it. Tell the instructor what they should remember to show to the students.

[mgeisler]

Please update the speaker notes instead.

[sudonym1]

Sure, I can do that.

[mgeisler]

Sure, I can do that.

Awesome 😄 You simply need a <details> ... </details> element with some Markdown at the bottom of the page, that's it. There are a few examples of this in the course now: https://google.github.io/comprehensive-rust/welcome-day-1.html

[mgeisler]

Let me close this PR for now — please open another with updated speaker notes if you find time 😄