message: doc: add arm macOS depends platform triplet
diff: @@ -29,6 +29,7 @@ Common `host-platform-triplet`s for cross compilation are:
  - `x86_64-pc-linux-gnu` for x86 Linux
  - `x86_64-w64-mingw32` for Win64
  - `x86_64-apple-darwin` for macOS
  +- `arm64-apple-darwin` for ARM macOS
  - `arm-linux-gnueabihf` for Linux ARM 32 bit
  - `aarch64-linux-gnu` for Linux ARM 64 bit
  - `powerpc64-linux-gnu` for Linux POWER 64-bit (big endian)
  