fix typos

Signed-off-by: allencloud <allen.sun@daocloud.io>
Upstream-commit: c1be45fa38e82054dcad606d71446a662524f2d5
Component: engine

components/engine/pkg/httputils/resumablerequestreader_test.go

@@ -99,7 +99,7 @@ func (errorReaderCloser) Read(p []byte) (n int, err error) {
 	return 0, fmt.Errorf("An error occurred")
 }
 
-// If a an unknown error is encountered, return 0, nil and log it
+// If an unknown error is encountered, return 0, nil and log it
 func TestResumableRequestReaderWithReadError(t *testing.T) {
 	var req *http.Request
 	req, err := http.NewRequest("GET", "", nil)