[docs] Update references and borrowing (Fixes #29730)

[norcalli]

Fixes #29730

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @nikomatsakis (or someone else) soon.

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[steveklabnik]

@bors: r+ rollup

thanks so much!

[bors]

📌 Commit 7b9b9df has been approved by steveklabnik

[bors]

⌛ Testing commit 7b9b9df with merge b850030...

[bors]

💔 Test failed - auto-mac-64-nopt-t

[norcalli]

lol how even does this fail. Is it the warnings that cause this? I've noticed that sometimes pull requests by people fail and you guys just retry. Is this something that would be worth taking a look at (by me)?

[steveklabnik]

@bors: retry

[steveklabnik]

@norcalli I think it's just a transient error

[bors]

⌛ Testing commit 7b9b9df with merge 3042fed...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt