Change read receipts tooltip copy

### Your use case

#### What would you like to do?

Change the read receipt tooltip copy

#### Why would you like to do it?

The current copy is slightly confusing, it says "seen by X people", where that's not true, it's been seen by that amount of people + the sum of all people that read newer messages.

The data it shows is the number of people who've read the room up until this point and not the amount of people who's seen this event.

#### How would you like to achieve it?

I don't know. What I know is that calculating the amount of people who've actually read this event accurately is probably a no go as clients would have to do a very large amount of work to infer that number

### Have you considered any alternatives?

_No response_

### Additional context

_No response_