update identifier naming warnings to give an example

This updates identifier warnings such as ``struct `foo_bar` should have a
camel case identifier`` to provide an example.

Closes #14738.
std::io: expand the oneshot/periodic docs.

Examples!

Fixes #14714.
auto merge of #14745 : huonw/rust/timer-doc, r=alexcrichton

std::io: expand the oneshot/periodic docs.

Examples!

Fixes #14714.
Implement Hash for Bitv and BitvSet

Closes #14744
auto merge of #14749 : sfackler/rust/bitv-hash, r=alexcrichton

Closes #14744
Fix spelling errors in comments.
auto merge of #14751 : jbcrail/rust/fix-comments, r=alexcrichton
relicense shootout-fannkuch-redux.rs

Part of #14248

Main contributors are @pcwalton, @alexcrichton and me.  Only
@dguenther appear in git blame as a minor contribution, but it is
only adding the rust license, so removed by this relicensing.
auto merge of #14756 : TeXitoi/rust/relicense-shootout-fannkuch-redux, r=brson

Part of #14248

Main contributors are @pcwalton, @alexcrichton and me.  Only
@dguenther appear in git blame as a minor contribution, but it is
only adding the rust license, so removed by this relicensing.

@brson OK?
Converted PortReader and ChanWriter to use Vec.
auto merge of #14765 : rapha/rust/master, r=alexcrichton
core: Rename `container` mod to `collections`. Closes #12543

Also renames the `Container` trait to `Collection`.

[breaking-change]
auto merge of #14740 : P1start/rust/name-warnings, r=alexcrichton

This updates identifier warnings such as ``struct `foo_bar` should have a
camel case identifier`` to provide an example.

Closes #14738.
core: Move the collections traits to libcollections

This commit moves Mutable, Map, MutableMap, Set, and MutableSet from
`core::collections` to the `collections` crate at the top-level. Additionally,
this removes the `deque` module and moves the `Deque` trait to only being
available at the top-level of the collections crate.

All functionality continues to be reexported through `std::collections`.

[breaking-change]
auto merge of #14709 : alexcrichton/rust/collections, r=brson

This is mostly just a cosmetic change, continuing the work from #14333.