Documentation: Bullet list in Deref documentation not working, causing confusing

[kumbayo]

The documentation of Deref/DerefMut wants to show a list with 3 bullet points.
https://doc.rust-lang.org/nightly/std/ops/trait.Deref.html#more-on-deref-coercion

But instead all 3 list entries are squashed together into a single block separated by 3 * characters.

This * character is a bit confusing in the context of dereferencing operations which uses the *.

In other parts of the documentation, bullet list seem to work normally.
https://doc.rust-lang.org/nightly/std/primitive.f32.html#method.atan2
Not sure what the difference is here.

CC @lukaramu You seem to have added these in 5990be5

[steveklabnik]

see https://github.com/rust-lang/rust/blob/master/src/libcore/ops/deref.rs#L29-L33

vs

rust/src/libstd/f32.rs

Lines 870 to 873 in af049cd

	/// * `x = 0`, `y = 0`: `0`
	/// * `x >= 0`: `arctan(y/x)` -> `[-pi/2, pi/2]`
	/// * `y >= 0`: `arctan(y/x) + pi` -> `(pi/2, pi]`
	/// * `y < 0`: `arctan(y/x) - pi` -> `(-pi, -pi/2)`

I have a hunch that you need an extra line of whitespace before the list. We should do it anyway, but that may or may not also fix this issue.

[chordowl]

That was probably caused by me being used to GitHub's markdown implementation, in which the extra whitespace line is not required 😅

I'll send out a fix PR!