message: guix: Update HOSTS README entry for new architectures
diff: @@ -102,10 +102,8 @@ find output/ -type f -print0 | sort -z | xargs -r0 sha256sum
  * _**HOSTS**_
  Override the space-separated list of platform triples for which to perform a
  - bootstrappable build. _(defaults to "x86\_64-linux-gnu
  - arm-linux-gnueabihf aarch64-linux-gnu riscv64-linux-gnu")_
  -
  - > Windows and OS X platform triplet support are WIP.
  + bootstrappable build. _(defaults to "x86\_64-linux-gnu arm-linux-gnueabihf
  + aarch64-linux-gnu riscv64-linux-gnu x86_64-w64-mingw32")_
  * _**SOURCES_PATH**_
  