Refactor: change process.exit comments.

Based on
ColemanGariety/gulp-nodemon@8ee28a46a9f335d9ba
bf0131fde29b646cc621c3
Notes:
    - ColemanGariety/gulp-nodemon#77 work on
Mac but not Windows.
    - Not listening to SIGTERM, like
https://github.com/webpack/webpack-dev-server/blob/93cb3dc600e6c547cec75
80ace4bf4a56cf2fe98/bin/webpack-dev-server.js
    - Also consider https://github.com/sindresorhus/exit-hook and it’s
active fork.

src/index.js

@@ -41,15 +41,11 @@ module.exports = class {
 
         this.isNodemonRunning = true
 
-        // Ensure Ctrl-c stop nodemon.
-        // Based on https://github.com/JacksonGariety/gulp-nodemon/commit/8ee28a46a9f335d9babf0131fde29b646cc621c3
-        // Notes:
-        // - https://github.com/JacksonGariety/gulp-nodemon/issues/77 work on Mac but not Windows.
-        // - Not listening to SIGTERM, like https://github.com/webpack/webpack-dev-server/blob/93cb3dc600e6c547cec7580ace4bf4a56cf2fe98/bin/webpack-dev-server.js
-        // - Also consider https://github.com/sindresorhus/exit-hook
+        // Ensure we exit nodemon when webpack exists.
         process.once( 'exit', () => {
             monitor.emit( 'exit' )
         })
+        // Ensure Ctrl-C triggers exit.
         process.once( 'SIGINT', () => {
             process.exit( 0 )
         })