[Story] Update the "Learn more" link on "Confirm your identity" screen

### Description

The "Learn more" link on the "Confirm your identity" currently opens https://element.io/help#encryption. This is not very helpful as the E2EE paragraph has now quite a few different questions in it, so the user does not get any specific advice.

Instead, it would be much better to open https://element.io/help#encryption-device-verification which has been added meanwhle, and talks specifically about verifying the device.

### Acceptance criteria
- The user is taken to https://element.io/help#encryption-device-verification

### Leads
* Tech:
* Design:

### Time sheeting

?

### Documentation
-

### Dependencies
- None

### Out of scope
- Nothing

### Open questions
- [ ]

## Subtasks

### Android
- https://github.com/element-hq/element-x-android/issues/4684

### iOS
- https://github.com/element-hq/element-x-ios/issues/4095

### Marketing
- [x] Have a more robust html id than `encryption11`

### Other
-

## Sign-offs
### Android
- [ ] Design sign-off on completion
- [ ] QA sign-off on completion
- [ ] Product sign-off on completion

### iOS
- [ ] Design sign-off on completion
- [ ] QA sign-off on completion
- [ ] Product sign-off on completion

Start with the Android subtask (#4684) and iOS subtask (#4095), then locate the “Confirm your identity” screen in each client. Verify that its “Learn more” link uses https://element.io/help#encryption-device-verification; done means the acceptance criterion passes on both platforms and the required sign-offs are complete.

Written by the indexing model from the issue text.