This PR fixes a small typo in the ExitCodeGenerator documentation in the Core Freatures/SpringApplication/Application Exit section.

Comment From: pivotal-cla

@BartR96 Please sign the Contributor License Agreement!

Click here to manually synchronize the status of this Pull Request.

See the FAQ for frequently asked questions.

Comment From: pivotal-cla

@BartR96 Thank you for signing the Contributor License Agreement!

Comment From: mhalbritter

Thanks!