Iterator::all() - document short-circuiting property parallel to any()

[birkenfeld]

No description provided.

[rust-highfive]

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[sfackler]

@bors: r+ rollup

[bors]

📌 Commit 56f3282 has been approved by sfackler

[bors]

⌛ Testing commit 56f3282 with merge 753a6a9...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-x-android-t, 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