docs(bonfire): the ErrReported comment names the WithExitCode code (IN-14)

modules/bonfire/errors.go

@@ -71,7 +71,8 @@ func WithHint(err error, explanation, try string) error {
 }
 
 // ErrReported marks an error whose details the command already printed:
-// the error block prints nothing and the exit code is 1.
+// the error block prints nothing and the exit code is 1, or the code given
+// with WithExitCode.
 var ErrReported = errors.New("bonfire: error already reported")
 
 type reportedError struct {