Better description on resetting Security Key consequences

### Your use case

#### What would you like to do?
Understand better what happens when resetting the Security Key. Will I lose access to past encrypted messages?

#### Why would you like to do it?
Because I lost my Security Key and want to recover it.

#### How would you like to achieve it?
Improving the description of the resetting Security Key consequences:

### Have you considered any alternatives?

_No response_

### Additional context

I am also logged in on my phone. But every time I am logged out from a device, I am unable to see the old messages.

And I believe that if I was able to recover my Security Key, I could back up my messages and thus recover them when logging in on a new device.