…borrow occurs in loop iteration

This allows you to open the help section in a new browser tab, which is a
pretty reasonable thing to want for a documentation page.

…illot

Fix missing explanation of where the borrowed reference is used when the same borrow occurs multiple times due to loop iterations

Fix rust-lang#99824.

Problem of the issue:
If a borrow occurs in a loop, the borrowed reference could be invalidated at the same place at next iteration of the loop. When this happens, the point where the borrow occurs is the same as the intervening point that might invalidate the reference in the loop. This causes a problem for the current code finding the point where the resulting reference is used, so that the explanation of the cause will be missing. As the second point of "explain all errors in terms of three points" (see [leveraging intuition framing errors in terms of points"](https://rust-lang.github.io/rfcs/2094-nll.html#leveraging-intuition-framing-errors-in-terms-of-points), this explanation is very helpful for user to understand the error.

In the current implementation, the searching region for finding the location where the borrowed reference is used is limited to between the place where the borrow occurs and the place where the reference is invalidated. If those two places happen to be the same, which indicates that the borrow and invalidation occur at the same place in a loop, the search will fail.

One solution to the problem is when these two places are the same,  find the terminator of the loop, and then use the location of the loop terminator instead of the location of the borrow for the region to find the place where the borrowed reference is used.

Update pkg-config

I'd like to be able to cross-compile rustc in a scenario where it'd be really helpful to have rust-lang/pkg-config-rs@cd3ccca.  I've done some test builds of the compiler on x86_64 linux, targeting x86_64 linux and aarch64 linux.

…GuillaumeGomez

rustdoc: make the help button a link to a page

This allows you to open the help section in a new browser tab, which is a pretty reasonable thing to want for a documentation page.

Preview: http://notriddle.com/notriddle-rustdoc-demos/help-page/std/index.html

…imes, r=cjgillot

pretty: fix to print some lifetimes on HIR pretty-print

HIR pretty-printer doesn't seem to print some lifetimes in types. This PR fixes that.

Closes rust-lang#85089

Surround type with backticks

Very smol PR. :)

…r=notriddle

Fix settings page

Thanks to rust-lang#103060, I discovered that the settings page was badly rendered. This PR fixes it.

Before:
![Screenshot from 2022-10-15 16-02-41](https://user-images.githubusercontent.com/3050060/195990668-42e0b16b-3146-4864-b822-6f6a80fb77a5.png)

After:
![Screenshot from 2022-10-15 16-02-31](https://user-images.githubusercontent.com/3050060/195990664-20f967df-8989-4336-bca9-be52baab8e81.png)

r? ``@notriddle``