Confusing speaker notes for 9.1 - Shared references

[ColinPitrat]

There's a confusing bullet point in Day 1 afternoon, 9.1 Shared references:

Rust is tracking the lifetimes of all references to ensure they live long enough.
Dangling references cannot occur in safe Rust.
x_axis would return a reference to point, but point will be deallocated when the function returns, so this will not compile.

The code in the slide doesn't contain x_axis nor point.

[ColinPitrat]

Progressing to 9.2 it seems this point probably belongs there! There's still no x_axis but there's a point and a x_coord.

[djmitche]

Good spot! I think that was just a leftover from when this slide was more complicated. We get to dangling references in later days. I'll make a PR shortly.