(docs): Fix wrong output of variable in Action View Helpers guide

Author: jrodriigues

guides/source/action_view_helpers.md

@@ -837,7 +837,7 @@ The return of capture is the string generated by the block.
 
 ``` ruby
 @greeting
-# => "Welcome to my shiny new web page! The date and time is 2018-09-06 11:09:16 -0500"
+# => "Welcome! The date and time is 2018-09-06 11:09:16 -0500"
 ```
 
 See the [`capture` API