Merge pull request rails#42096 from jadeforrest/patch-1

Specify rails --version check should be in a new terminal

Author: zzak

guides/source/getting_started.md

@@ -154,7 +154,7 @@ $ gem install rails
 ```
 
 To verify that you have everything installed correctly, you should be able to
-run the following:
+run the following in a new terminal:
 
 ```bash
 $ rails --version