Print distro in doctor output

[zvecr]

Description

Linux

Ψ QMK Doctor is checking your environment.
Ψ CLI version: 1.1.1
Ψ QMK home: /home/zvecr/qmk_firmware
Ψ Detected Linux (Manjaro Linux).

WSL

Ψ QMK Doctor is checking your environment.
Ψ CLI version: 1.1.1
Ψ QMK home: /home/qmk/qmk_firmware
Ψ Detected Linux (WSL, Debian GNU/Linux 11 (bullseye)).

Msys

Ψ QMK Doctor is checking your environment.
Ψ CLI version: 1.1.1
Ψ QMK home: C:/Users/zvecr/qmk_firmware
Ψ Detected Windows 10 (10.0.22000).
Ψ QMK MSYS version: 1.7.2

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[fauxpark]

Vanilla MSYS2 also has an os-release, but it's not that informative:

$ cat os-release
NAME=MSYS2
ID=msys2
PRETTY_NAME="MSYS2"
ID_LIKE="cygwin arch"
HOME_URL="https://www.msys2.org"
BUG_REPORT_URL="https://github.com/msys2/MSYS2-packages/issues"