[ci skip] update guide for Puma web server instead of Webrick

Rails 5.0 default server puma web server. following commit - https://github.com/rails/rails/commit/ae48ea69

1 files changed, 8 insertions, 7 deletions

diff --git a/guides/source/command_line.md b/guides/source/command_line.md
index 5240b5f343..d31b3084e5 100644
--- a/guides/source/command_line.md
+++ b/guides/source/command_line.md
@@ -55,20 +55,21 @@ Rails will set you up with what seems like a huge amount of stuff for such a tin
 
 ### `rails server`
 
-The `rails server` command launches a small web server named WEBrick which comes bundled with Ruby. You'll use this any time you want to access your application through a web browser.
+The `rails server` command launches a web server named Puma which comes bundled with Rails. You'll use this any time you want to access your application through a web browser.
 
 With no further work, `rails server` will run our new shiny Rails app:
 
 ```bash
 $ cd commandsapp
 $ bin/rails server
-=> Booting WEBrick
-=> Rails 5.0.0 application starting in development on http://localhost:3000
+=> Booting Puma
+=> Rails 5.0.0 application starting in development on http://0.0.0.0:3000
 => Run `rails server -h` for more startup options
 => Ctrl-C to shutdown server
-[2013-08-07 02:00:01] INFO  WEBrick 1.3.1
-[2013-08-07 02:00:01] INFO  ruby 2.2.2 (2015-06-27) [x86_64-darwin11.2.0]
-[2013-08-07 02:00:01] INFO  WEBrick::HTTPServer#start: pid=69680 port=3000
+Puma 2.15.3 starting...
+* Min threads: 0, max threads: 16
+* Environment: development
+* Listening on tcp://localhost:3000
 ```
 
 With just three commands we whipped up a Rails server listening on port 3000. Go to your browser and open [http://localhost:3000](http://localhost:3000), you will see a basic Rails app running.
@@ -181,7 +182,7 @@ Fire up your server using `rails server`.
 
 ```bash
 $ bin/rails server
-=> Booting WEBrick...
+=> Booting Puma...
 ```
 
 The URL will be [http://localhost:3000/greetings/hello](http://localhost:3000/greetings/hello).