Adds `jira_connect_public_key_storage_enabled` field

What does this MR do and why?

This MR updates the documentation to reflect our current API.

Screenshots or screen recordings

N/A

How to set up and validate locally

1. Verify that jira_connect_public_key_storage_enabled field could be updated via api/v4/aapplication/settings endpoint
2. Checkout the branch
3. Verify that everything works as expected