For the reference see my comment in https://issues.jenkins.io/browse/JENKINS-34612?focusedCommentId=401331&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-401331

There is two related issues for improving this functionality:

https://issues.jenkins.io/browse/JENKINS-62220

https://issues.jenkins.io/browse/JENKINS-62594

This ticket is to merely fix the text labels. The `Owner` field in the GitHub App credentials entry by looking just at its name suggests the owner of the app, i.e. a user or the org that has created the app. In fact, the value should be the user/org that has this app installed, as description suggests:

The organisation or user that this app is to be used for. Only required if this app is installed to multiple organisations.

BTW there is also a typo in the description. It should be organizations not organisations.