posts: update rustup.1.23.0 release with Pietro's wording

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>

Author: kinnison

posts/2020-11-27-Rustup-1.23.0.md

@@ -25,47 +25,59 @@ If you don't have it already, you can [get rustup][install] from the appropriate
 
 ## What's new in rustup 1.23.0
 
-This release has a few important things we'd like to highlight:
-
-`rustup` is now available for the Apple M1 based computers. We now have an
-`aarch64-apple-darwin` release of `rustup` which means that you ought to
-be able to install a native `rustup` and compiler toolset on that platform.
-
-**NOTE:** As of the time of this blog post, there is no _stable_ release of
-the M1 toolchain, so you will need to select `beta` or `nightly` when
-prompted for a toolchain to install. Also, this new platform is currently
-only supported at Tier 2. You can track the support details here:
-<https://github.com/rust-lang/rust/issues/73908>
-
-There is now support for two-part version numbers. You can
-`rustup toolchain install 1.48` for example, and this will provide you with a
-`1.48` toolchain which will update if a `1.48.1` toolchain update were released.
-This can be useful if you often want the latest patch of a particular compiler
-release for CI etc.
-
-The documentation for `rustup` is now in an mdbook style book and is published
-here: <https://rust-lang.github.io/rustup/>
-
-We now support a structured `rust-toolchain` file format, though the current
-single-line simple format is still supported. You can find more
-information in the [overrides chapter][toolchain-file] of our new book, but here
-is an example of a new toolchain override file which selects a specific version
-of `nightly`, requires `clippy`, and causes the `wasm32-unknown-unknown` target
-to be installed as well:
+### Support for Apple M1 devices
+
+Rustup is now natively available for the new Apple M1 devices, allowing you to install it on the new Macs the same way you'd install it on other platforms!
+
+Note that at the time of writing this blog post the `aarch64-apple-darwin` compiler is at [Tier 2 target][tiers]: precompiled binaries are available starting from Rust 1.49 (currently in the beta channel), but no automated tests are executed on them.
+
+You can follow [issue #73908][rust/73908] to track the work needed to bring Apple Silicon support to Tier 1.
+
+[tiers]: https://doc.rust-lang.org/rustc/platform-support.html#tier-2
+[rust/73908]: https://github.com/rust-lang/rust/issues/73908
+
+### Support for installing minor releases
+
+The Rust team releases a new version every six weeks, bringing new features and bugfixes on a regular basis. Sometimes a regression slips into a stable release, and the team releases a "point release" containing fixes for that regression. For example, [1.45.1] and [1.45.2] were point releases of [Rust 1.45.0][1.45.0], while [1.46.0] and [1.47.0] both had no point releases.
+
+With rustup 1.22.1 or earlier if you wanted to use a stable release you were able to either install `stable` (which automatically updates to the latest one) or a specific version number, such as `1.48.0`, `1.45.0` or `1.45.2`. Starting from this release of rustup (1.23.0) you can also install a minor version without specifying the patch version, like `1.48` or `1.45`. These "virtual" releases will always point to the latest patch release of that cycle, so `rustup toolchain install 1.45` will get you a [1.45.2] toolchain.
+
+[1.45.0]: https://blog.rust-lang.org/2020/07/16/Rust-1.45.0.html
+[1.45.1]: https://blog.rust-lang.org/2020/07/30/Rust-1.45.1.html
+[1.45.2]: https://blog.rust-lang.org/2020/08/03/Rust-1.45.2.html
+[1.46.0]: https://blog.rust-lang.org/2020/08/27/Rust-1.46.0.html
+[1.47.0]: https://blog.rust-lang.org/2020/10/08/Rust-1.47.html
+
+### New format for `rust-toolchain`
+
+The rustup 1.5.0 release introduced the `rust-toolchain` file, allowing you to choose the default toolchain for a project. When the file is present rustup ensures the toolchain specified in it is installed on the local system, and it will use that version when calling `rustc` or `cargo`:
+
+```
+$ cat rust-toolchain
+nightly-2020-07-10
+$ cargo --version
+cargo 1.46.0-nightly (fede83ccf 2020-07-02)
+```
+
+The file works great for projects wanting to use a specific nightly version, but didn't allow to add extra components (like `clippy`) or compilation targets. Rustup 1.23.0 introduces a new, optional TOML syntax for the file, with support for specifying components and targets:
 
 ```toml
 [toolchain]
-channel = "nightly-2020-11-27"
-components = [ "clippy" ]
-targets = [ "wasm32-unknown-unknown" ]
+channel = "nightly-2020-07-10"
+components = ["rustfmt", "clippy"]
+targets = ["wasm32-unknown-unknown"]
 ```
 
-[toolchain-file]: https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file
+The new syntax doesn't replace the old one, and both will continue to work. You can learn more about overriding the default toolchain in the ["Overrides" chapter of the rustup book][overrides].
+
+[overrides]: https://rust-lang.github.io/rustup/overrides.html#the-toolchain-file
+
+### Other changes
 
-There are many more changes in 1.23.0, and we invite you to take a look at our
-[changelog][] if you'd like to know more.
+There are more changes in rustup 1.23.0: check them out in the [changelog]! Rustup's documentation is also available in [the rustup book][book] starting from this release.
 
 [changelog]: https://github.com/rust-lang/rustup/blob/stable/CHANGELOG.md
+[book]: https://rust-lang.github.io/rustup/
 
 ## Thanks