MDEV-15825 Mariabackup help mentions Percona and PXC but not MariaDB

extra/mariabackup/innobackupex.cc

@@ -255,7 +255,7 @@ static struct my_option ibx_long_options[] =
 	{"galera-info", OPT_GALERA_INFO, "This options creates the "
 	 "xtrabackup_galera_info file which contains the local node state at "
 	 "the time of the backup. Option should be used when performing the "
-	 "backup of Percona-XtraDB-Cluster. Has no effect when backup locks "
+	 "backup of MariaDB Galera Cluster. Has no effect when backup locks "
 	 "are used to create the backup.",
 	 (uchar *) &opt_ibx_galera_info, (uchar *) &opt_ibx_galera_info, 0,
 	 GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},

extra/mariabackup/xtrabackup.cc

@@ -694,7 +694,7 @@ struct my_option xb_client_options[] =
   {"galera-info", OPT_GALERA_INFO, "This options creates the "
    "xtrabackup_galera_info file which contains the local node state at "
    "the time of the backup. Option should be used when performing the "
-   "backup of Percona-XtraDB-Cluster. Has no effect when backup locks "
+   "backup of MariaDB Galera Cluster. Has no effect when backup locks "
    "are used to create the backup.",
    (uchar *) &opt_galera_info, (uchar *) &opt_galera_info, 0,
    GET_BOOL, NO_ARG, 0, 0, 0, 0, 0, 0},