Form sharing and access options need clarification

### Description

According to user reports in support tickets, some users would like clarification about interactions of Form sharing options with CryptPad specific privacy features, especially Access list. There is a lack of clear information in CryptPad's documentation about how enabling the Access list can impact access to Forms shared using a public link.

### Steps to reproduce

n/a

### Relevant logs

```shell

```

### Expected behavior

From a user ticket (regarding Access list functionality): "having a clear description of how the features interact would be helpful. Having a chart or interactive widget to help you choose the settings for the desired outcome would help too. Finally, there is no mention of Forms, which presumably, people want to share the form entry but not the form data. "

### Which operating system are you using?

_No response_

### What browsers are you seeing the problem on?

_No response_

### Extensions

n/a

### Version

2026.2.0