Fix links in From, Into, Cursor docs

[ghost]

Tidied up some more issues with quote/bracket nesting. These are the last ones that I could easily find.

r? @steveklabnik

[rust-highfive]

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[GuillaumeGomez]

Not sure to understand why this change is useful...

[ollie27]

You can see how this renders here. Basically you can't have links inside code blocks.

Before:

• From<T> for U implies [Into<U>] for T

After:

• From<T> for U implies Into<U>for T

[GuillaumeGomez]

Just a point which needs explanation otherwise it's all good.

[ollie27]

I've also fixed these as part of #37316.

[ghost]

@ollie27 Thanks and well spotted! This pull is a dupe then.