Merge pull request rails#21159 from tcopeland/fix_speling

Fix doc typo

Author: kaspth

guides/source/upgrading_ruby_on_rails.md

@@ -75,7 +75,7 @@ warning by adding the following configuration to your `config/application.rb`:
 
 See [#17227](https://github.com/rails/rails/pull/17227) for more details.
 
-### ActiveJob jobs now inherent from ApplicationJob by default
+### ActiveJob jobs now inherit from ApplicationJob by default
 
 In Rails 4.2 an ActiveJob inherits from `ActiveJob::Base`. In Rails 5.0 this
 behavior has changed to now inherit from `ApplicationJob`.