Correct process.kill doc

Thanks Kevin. Closes GH-518.

doc/api/process.markdown

@@ -230,11 +230,11 @@ A compiled-in property that exposes `NODE_PREFIX`.
     console.log('Prefix: ' + process.installPrefix);
 
 
-### process.kill(pid, signal='SIGINT')
+### process.kill(pid, signal='SIGTERM')
 
 Send a signal to a process. `pid` is the process id and `signal` is the
 string describing the signal to send.  Signal names are strings like
-'SIGINT' or 'SIGUSR1'.  If omitted, the signal will be 'SIGINT'.
+'SIGINT' or 'SIGUSR1'.  If omitted, the signal will be 'SIGTERM'.
 See kill(2) for more information.
 
 Note that just because the name of this function is `process.kill`, it is