message: Add better example JSON to internal comment
diff: @@ -21,7 +21,7 @@ const VERSION: u32 = 1;
  // "pointer_width":"64",
  // "vendor":"pc"
  // },
  -// "targets": [
  +// "targets": {
  // "x86_64-unknown-linux-gnu": {
  // "names": ["debug_assertions", "unix"],
  // "arch":"x86_64",
  @@ -32,8 +32,19 @@ const VERSION: u32 = 1;
  // "os":"linux",
  // "pointer_width":"64",
  // "vendor":"unknown"
  +// },
  +// "i686-pc-windows-msvc": {
  +// "names": ["windows", "debug_assertions"],
  +// "arch":"x86",
  +// "endian":"little",
  +// "env":"msvc",
  +// "family":"windows",
  +// "features":["fxsr","sse","sse2"],
  +// "os":"windows",
  +// "pointer_width":"32",
  +// "vendor":"pc"
  +// }
  // }
  -// ]
  // }
  #[derive(serde::Serialize)]
  