Update Arch Linux ARM compiler installation instructions

- Add copy-pasteable Arch Linux `arm-none-eabi-gcc` install line similar to Ubuntu example
- Add `arm-none-eabi-newlib` as a required package for Arch
- Reformat Ubuntu and Arch install code-blocks to catch the eye for the impatient

Arch Linux changed their packaging for [arm-none-eabi-gcc](https://www.archlinux.org/packages/community/x86_64/arm-none-eabi-gcc/) by creating [arm-none-eabi-newlib](https://www.archlinux.org/packages/community/any/arm-none-eabi-newlib/) as an optional package. Without it users will get errors about missing header files like:

```
In file included from asf4/samd51/include/samd51j19a.h:49,
                 from asf4/samd51/include/sam.h:38,
                 from ./mpconfigport.h:31,
                 from ../../py/mpconfig.h:45,
                 from ../../py/emitnx64.c:3:
/usr/lib/gcc/arm-none-eabi/9.1.0/include/stdint.h:9:16: fatal error: stdint.h: No such file or directory
    9 | # include_next <stdint.h>
      |                ^~~~~~~~~~
compilation terminated.
```
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  1. 17
      ports/atmel-samd/README.rst

@ -124,15 +124,20 @@ Setup
-----
An ARM compiler is required for the build, along with the associated binary
utilities. On Ubuntu, these can be installed as follows:
utilities. They can be installed as follows:
.. code-block:: shell
- Ubuntu
.. code-block:: shell
sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa
sudo apt-get install gcc-arm-embedded
- Arch Linux
sudo add-apt-repository ppa:team-gcc-arm-embedded/ppa
sudo apt-get install gcc-arm-embedded
.. code-block:: shell
On Arch Linux the compiler is available for via the package
``arm-none-eabi-gcc``.
sudo pacman -S arm-none-eabi-gcc arm-none-eabi-newlib
For other systems, the `GNU Arm Embedded Toolchain <https://developer.arm.com/open-source/gnu-toolchain/gnu-rm/downloads>`_
may be available in binary form.

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