Implement `process.arch` to get a String of the current processor arc…
…hitecture, with docs.
|@@ -271,6 +271,13 @@ The PID of the process.|
|Getter/setter to set what is displayed in 'ps'.|
|+What processor architecture you're running on. `'arm'`, `'ia32'`, etc.|
|+ console.log('This processor architecture is ' + process.arch);|
|What platform you're running on. `'linux2'`, `'darwin'`, etc.|