[skip ci]Fix allocator typo (#10274)

Signed-off-by: Ngodchen <qingxiang.chen@zilliz.com>

internal/allocator/allocator.go

@@ -79,7 +79,7 @@ type EmptyTicker struct {
 	tChan <-chan time.Time
 }
 
-// Chan return a read-only channel from which you can only receive time.Time type data.
+// Chan returns a read-only channel from which you can only receive time.Time type data.
 // As for EmptyTicker, you will never read data from Chan.
 func (t *EmptyTicker) Chan() <-chan time.Time {
 	return t.tChan