Typo fix: s/prefect/perfect/

library/std/src/sys/io/error/windows.rs

@@ -81,7 +81,7 @@ pub fn decode_error_kind(errno: i32) -> io::ErrorKind {
         c::WSAENETDOWN => NetworkDown,
         c::WSAENETUNREACH => NetworkUnreachable,
         c::WSAEDQUOT => QuotaExceeded,
-        // Not a prefect mapping but this error is only returned when writing to
+        // Not a perfect mapping but this error is only returned when writing to
         // a socket after shutting down the write-end. On Unix targets, EPIPE is
         // returned in those cases.
         c::WSAESHUTDOWN => BrokenPipe,