[doc] The capture method isn't always used inside views to create a variable

but rather very often used inside helpers to directly return a String value.
[ci skip]

actionview/lib/action_view/helpers/capture_helper.rb

@@ -9,8 +9,8 @@ module Helpers
     # It provides a method to capture blocks into variables through capture and
     # a way to capture a block of markup for use in a layout through content_for.
     module CaptureHelper
-      # The capture method allows you to extract part of a template into a
-      # variable. You can then use this variable anywhere in your templates or layout.
+      # The capture method extracts part of a template as a String object.
+      # You can then use this object anywhere in your templates, layout, or helpers.
       #
       # The capture method can be used in ERB templates...
       #