r? @steveklabnik

Indicate how it gets created and add an example.

… r=steveklabnik

Syntax coloring and more compact diagram

Two cosmetic improvements:
- New content was added a few days ago to the **Closures** chapter but it was missing rust's syntax coloring.
- Also, in the **Crates and Modules** chapter, a diagram was improved to be more symmetric and to take less space.

update reference for rust-lang#29734

Traits where syntax's extra usage example more clearly

r? @steveklabnik

Add example for `std::thread::sleep`.

None

…teveklabnik

[doc] Fix links in Ownership section of the book

- Add a missing link definition for `[i32]`.
- Like `[stack]` link is pointing to `...#the-stack`, append `#the-heap` to `[heap]` link.

…Gomez

Add example with leading zeros

I was searching for this format very long. So I added an example to the prominent section.

I was thinking of putting the keyword leading in the corresponding section as well, what do you think?

r? @steveklabnik

…bnik

Fix E0269 error explanation

r? @steveklabnik

…eGomez

Expand `std::path::Component` documentation.

Indicate how it gets created and add an example.

…st, r=GuillaumeGomez

rustdoc: Fix inlined renamed reexports in import lists

Fixes rust-lang#34473