This setting engages the native Atlassian Jira Cloud Smart Commit processor. At this time only
#transitions are supported for the triggers. This also enables the Automatic Workflow Triggers feature.
The automatic workflow triggers allows you to use your development activity to make automatic changes in your Jira project workflows. For example, you can use the workflow trigger to transition your Jira issues.
For more information on Automation for Jira, see article Git Integration + Jira Automation.
After all the settings have been configured according to your requirements, click Update to apply the changes.
More Jira development information settings
Enable Jira Cloud Smart Commits, Automation for Jira and Workflow Triggers setting (this page)