chore: fix some comments (mongodb#1747)

Signed-off-by: lencap <[email protected]>

Author: lencap

cmd/testoidcauth/main.go

@@ -365,7 +365,7 @@ func machine31failureWithCachedTokensFetchANewTokenAndRetryAuth() error {
 	authenticatorField = reflect.NewAt(
 		authenticatorField.Type(),
 		unsafe.Pointer(authenticatorField.UnsafeAddr())).Elem()
-	// this is the only usage of the x packages in the test, showing the the public interface is
+	// this is the only usage of the x packages in the test, showing the public interface is
 	// correct.
 	authenticatorField.Interface().(*auth.OIDCAuthenticator).SetAccessToken("some random happy sunshine string")
 
@@ -1180,7 +1180,7 @@ func human31usesSpeculativeAuth() error {
 	authenticatorField = reflect.NewAt(
 		authenticatorField.Type(),
 		unsafe.Pointer(authenticatorField.UnsafeAddr())).Elem()
-	// This is the only usage of the x packages in the test, showing the the public interface is
+	// This is the only usage of the x packages in the test, showing the public interface is
 	// correct.
 	authenticatorField.Interface().(*auth.OIDCAuthenticator).SetAccessToken(string(accessToken))