Word error
### Description

The assertion message is misspelled.
here: [https://github.com/nim-lang/Nim/blob/devel/lib/pure/asyncnet.nim#L918](https://github.com/nim-lang/Nim/blob/devel/lib/pure/asyncnet.nim#L918)
It should be “data”.

### Nim Version

devel

### Current Output

_No response_

### Expected Output

_No response_

### Known Workarounds

_No response_

### Additional Information

_No response_