Fix punctuation typo.

Author: Berrysoft

src/driver/iocp/mod.rs

@@ -38,7 +38,7 @@ pub(crate) use windows_sys::Win32::Networking::WinSock::{
 
 /// On windows, handle and socket are in the same size.
 /// Both of them could be attached to an IOCP.
-/// Therefore, both could be seen as fd;
+/// Therefore, both could be seen as fd.
 pub type RawFd = RawHandle;
 
 /// Extracts raw fds.