maintner: fix copy/paste errors

Change-Id: I8c4117cc3d90893c30e91d9c054b5713079391b2
Reviewed-on: https://go-review.googlesource.com/136538
Reviewed-by: Matt Layher <mdlayher@gmail.com>
Run-TryBot: Matt Layher <mdlayher@gmail.com>

maintner/github.go

@@ -679,7 +679,7 @@ func (c *Corpus) SetGitHubLimiter(l *rate.Limiter) {
 // The token is the auth token to use to make API calls.
 func (c *Corpus) TrackGitHub(owner, repo, token string) {
 	if c.mutationLogger == nil {
-		panic("can't TrackGerrit in non-leader mode")
+		panic("can't TrackGitHub in non-leader mode")
 	}
 
 	c.mu.Lock()

maintner/maintnerd/maintnerd.go

@@ -152,7 +152,7 @@ func main() {
 			log.Fatal(err)
 		}
 	default:
-		log.Fatalf("unknown --copnfig=%s", *config)
+		log.Fatalf("unknown --config=%s", *config)
 	}
 	if *genMut {
 		if *bucket != "" {