fix #1309 (#1317)

core/fx/stream.go

@@ -246,7 +246,7 @@ func (s Stream) Head(n int64) Stream {
 			}
 			if n == 0 {
 				// let successive method go ASAP even we have more items to skip
-				// why we don't just break the loop, because if break,
+				// why we don't just break the loop, because if breaks,
 				// this former goroutine will block forever, which will cause goroutine leak.
 				close(source)
 			}