Core Feature Added: pre signed url ajax download

[mmattel]

What Needs to be Documented?

https://github.com/owncloud/core/pull/38029 (Feature/pre signed url ajax download)

Where Does This Need To Be Documented?

Admin/User/Dev - TBD Needs to be investigated For upcoming 10.6 + master

Why Should This Change Be Made? (Optional)

New Feature

What Type Of Content Change Is This? (Optional)

• [x] New Content Addition
• [ ] Old Content Deprecation
• [ ] Existing Content Simplification
• [ ] Bug Fix to Existing Content

Which Manual Does This Relate To? (Optional)

• [x] Admin Manual
• [x] Developer Manual
• [x] User Manual
• [ ] Android
• [ ] iOS
• [ ] Branded Clients
• [ ] Desktop Client
• [ ] Other

@DeepDiver1975 @C0rby @phil-davis FYI