embed: Fix HTTPs -> HTTPS in error message

embed/etcd.go

@@ -623,7 +623,7 @@ func configureClientListeners(cfg *Config) (sctxs map[string]*serveCtx, err erro
 			}
 		}
 		if (u.Scheme == "https" || u.Scheme == "unixs") && cfg.ClientTLSInfo.Empty() {
-			return nil, fmt.Errorf("TLS key/cert (--cert-file, --key-file) must be provided for client url %s with HTTPs scheme", u.String())
+			return nil, fmt.Errorf("TLS key/cert (--cert-file, --key-file) must be provided for client url %s with HTTPS scheme", u.String())
 		}
 
 		network := "tcp"